I know there has been debate/speculation about whether this coaster will be launched, or start with classic lift hill. From what we have seen so far, it looks as if the ride will start with a steep incline (which hints towards a lift hill). But what if it was a mix, like the Hulk coaster as IOA = an inclined lift hill, ending with a launch and into an inversion at the top (instead of a tire launch, it would use Mack's LSM launch technology). Having a hypercoaster start off with a bang like that, would make for a very unique ride experience, and an element that would suit the Flash theme (if it is to be themed to DC's Flash superhero).
Imagine the station and queue being themed to Barry Allen's forensic lab. You then leave the station, head up the lift hill where it is enclosed in some sort of tunnel, with pipes and tanks full of toxic chemicals. Lightning strike effects go off, damaging the pipes and tanks, spilling toxic gasses over the train. You suddenly receive the Flash's superspeed powers, and launch up and out of the tunnel, entering an inversion and the rest of the coaster follows.
Not sure why the tunnel is filled with toxic chemicals, or why you are going up the tunnel in the first place......story is a bit wishy washy at this stage; but hopefully you get my drift. You are experiencing the events that turned Barry into the Flash.