The game will be produced by a company called Bigben Interactive, which worked with Milestone (the creator of Ride, and several motorbike games, that ran at 30 fps -sometimes a lot less than that- on the X360, which I know relatively well, since I have some of those games) before, but switched to Kylotonn Games. I don't know about the framerate of the game, but hopefully it will be consistent.
http://www.gamereactor.eu/news/287784/WRC+5+announced+for+new-gen+consoles/
http://www.gamereactor.eu/news/287784/WRC+5+announced+for+new-gen+consoles/