I'm actually quite surprised it can do 5fps, although the all important buffer capacity is usually something that people only find out from hands-on based reviews rather than spec sheets unfortunately. If it has an ok buffer depth, say 15 shots (I base this on the typically less 60D buffer, not on calculations) then it seems pretty decent to me even for full resolution casual sports/wildlife and that's not taking into account faster crop modes.
5fps is pretty good. The 645z maxes out at 3fps and the buffer craps out at 10 shots.
This sets a precedent for the 5D4 though. If it's 24mp you 'should' expect 10fps. This falls into line with the rumors on that it will be a jack of all trades. i.e. a direct competitor to the D750.