I've played both the previous games and so far I've really enjoyed the overall feel of the demo. There's just something about the movement that seems more satisfying.
The make or break for me will be career mode. I spend very little time outside of career mode in these games. I found the previous iterations training system to be very boring. To score max points in sparring, you just take the guy down, let him up, take him down, let him up. Otherwise your score tanks because of blocked strikes.