The framerate is almost always in the 50s, if not 60. It looks fantastic.
B2's framerate isn't great though honestly, maybe even worse than W101's.
I finished chapter 5 yesterday and so far the frame-rate is definitely better than TW101's. Also the game is freakin' beautiful, the new lighting engine makes a big difference and the art direction overall is top-notch.
Game is amazing thus far.