Given the Games are clearly the reason for the sudden large investments in the theme parks, here's my thoughts:
Firstly, remember that the Gold Coast is well known for it's theme parks - they are a icon.
Secondly, therefore, internationally the parks will get a lot of media coverage so the 1st thing all parks are going to do is refurbish - they want to look good for international media and visitors during the Games. As we can see, all the parks are doing this as we speak.
International visitors & media users, when they think of theme parks, expect hypercoasters, gigacoasters, stratacoasters etc, which none of these theme parks currently have. The closest in standard is Superman Escape, which doesn't qualify as a hypercoaster at a minimum, but is renowned as one of the best rollercoasters worldwide due to it's theming, flow and smoothness. Australian theme parks constantly tell us they can't build bigger rollercoasters due to it's costs and the size of the surrounding populations but if a reputation is at stake worldwide that the Gold Coast is Australia's 'theme park hub' then 1 hypercoaster at a minimum needs to be built. MW & DW were the 2 likeliest parks to have this built. I do recall someone saying that MW & DW have shared their plans in regards to pre-Games investments so given the enormous cost of a hypercoaster, I'll guess that they agreed that MW would build it (maybe they can handle the financial risks better?). Dreamworld may have taken a different strategy.
The Games won't see an increase in international tourism until the Games themselves and after a short interval, again after the Games - though some people argue these post-Games tourism boosts never eventuate. In my opinion, they do occur but not on the scale people imagine it to be. So the biggest new investments don't need to be opened until Boxing Day 2017 at the earliest - as we know, MW's new rollercoaster is rumoured to be opening then. The biggest investments I'd expect will open in 2018, 2019 and late 2017 with major refurbishments occurring up to mid/late 2017. Remember, in my initial post I said it gave me reason there will be a new DW rollercoaster no earlier than April 2018 - they said "at this stage" after all so they may have plans (which theme park wouldn't?) but for it to open after the Games in 2019/late-2018 or even later (but no later than 2022 like I said in my previous post).
The theme parks would obviously focus on improving all their theming as well as more focusing on their main themes (Australiana, water thrills, movies & the sea). Given that an increase in international visitation is highly expected to be a result of the Games, DW may focus on delivering more Australian experiences (e.g. Brock's Garage, Corroboree etc.) rather than thrills which MW can do as they are more flexible in this regard due to the movie theme they have (they are not limited to Australian movies). DW does have international things in their park (e.g. Tiger Island, Dreamworks Experience, Hotwheels Sidewinder etc.) but most of their park is still themed to Australia & international visitors to the Gold Coast would expect Australian experiences at DW rather than just general thrills that they know they can experience back home anyway. And when I mean 'experiences', I also mean Australian theming in rides. So in short, due to the Games & as a result of their respective themes, I'm expecting DW to more focus on the theming rather than thrill level of new rides while MW will focus on both thrill level & theming. Both parks will also ensure they cater for all audiences.
Lastly, all of this requires significant investment so they would need to save financial resources to do it. A lack of new developments anytime post-2011 (when Gold Coast won the Games hosting rights) should have been expected so massive developments can occur to open around April 2018.
If they did have plans, I'm sure they would have been tight-lipped and/or cryptic instead of just giving a direct answer implying no.
Regarding the latter sentence, if you constantly e-mail them or they figure out you are a theme park enthusiast, they will not answer queries about future investments as openly as they would with a non-theme park enthusiast as they know that with a theme park enthusiast, the information will very likely end up being posted on places like Parkz. That's why I don't ask on social media, I wait until a non-theme park enthusiast does - a more open response is likely to be delivered then.
I have noticed that, where possible, the social media teams of the Gold Coast theme parks give acknowledgement if management has not told them something or they can't confirm something.
@Ryande16, in my opinion, a person's opinion of a theme park should best be determined by the parks' use of theming. An amusement park should best be determined on how well it amuses you. For example, look at Superman Escape - in an amusement park, it would just be a rollercoaster - leave the station, turns some corners, pause, launch, up hills, down drops, hit the brakes, arrive at station & laugh at your ride-on photo - but in a theme park, it is an experience - waiting for a subway train where a earthquake occurs with the only way out being the subway itself and just before the subway caves in, Superman saves the day. Superman Escape without any theming would do it's job at an amusement park - you get G-forces, acceleration, speed, heights etc. - but not at a theme park, the ride would be really generic. Add all the theming that you get with Superman Escape & you can see the difference it makes so it is credited as one of the world's best theme park rollercoasters - that is definitely doing it's job at a theme park.
Really, the least thrilling rides can be made into a thrill by converting it into an themed experience. My favourite ride was Bermuda Triangle - not because of the ride design/type but because of the theming. When I think about Bermuda, for most of the ride, it is just people sitting in a boat - that's what you expect at an amusement park - but in Bermuda, they added roof cave-ins, dramatic music, lasers, fire/water/special effects, cinematic experiences, roaming characters etc. - it is an experience. That's what makes a great theme park ride.
The ultimate example is the walk-through: At an amusement park, walking down a path could be just that but add a theme to that walking path and you got a whole new and different experience. By the way, the best way to rank theme parks is a highly argued matter on Parkz so don't worry about it much (some people may disagree with my opinion too). Your opinion might be great for amusement parks but theme parks are a whole different ball park. In the end, it is your opinion.