Just because Robbie Amell was cast as Ronnie Raymond (a.k.a. Firestorm) on The Flash didn't necessarily mean that Raymond would ever become Firestorm on the show. In the comic books, Firestorm has flaming hair, which would have to involve some type of CGI to translate into television.
Well, based on a couple new posts to Amell's Facebook page, it looks like fans will get to see Raymond become Firestorm. Along with the photo below, Amell wrote, "Tracking marks and a mandatory headband. Face scans for #TheFlash. #Firestorm." Of course, the tracking marks and headband are almost a certain indication that Amell is doing motion capture so they can add Firestorm's flaming hair, etc. via CGI.
And if there were any doubt, Amell also posted a second photo, which pretty much spells it out. Along with the photo below, Amell wrote, "This is where I get my powers. #Firestorm." So, yes fans will definitely get to see Raymond get his Firestorm powers on The Flash.
The Flash is scheduled to premiere on October 7, 2014 at 8 PM on The CW.