Well…this got interesting.
In the recent trailer for Legends of Tomorrow, a sequence showed what appeared to be Harrison Wells (aka Reverse Flash) in a Time Sphere. Well, a pic presumably from the set not only confirms that, but teases a new hero possibly arriving!
See that helmet at the bottom? That is the helmet of the much respected Golden Age hero Jay Garrick, aka the ORIGINAL Flash. Now it’s not clear how this helmet came to be there, but with time travel now in the game for both Legends of Tomorrow and Flash, anything is possible!