You mean from tag to 4 right.. and that wasn't that much of a jump..
The issue with 4 was that they tried to spin the series into realism which the fans responded negatively to. With 5 they went back to awesome .. and naturally that was awesome.
The jump from 4 to 5 was almost as big as from 2 to 3.
I don't know if this jump will be that big.. But fuck man, I can't wait for this game :P
It really needs devil kazuya though :p
The game does offer brand new game mechanics and has redefined animations for all chars to seperate the way their moves look so that's all very cool !
EDIT: oh and I thought soul calibur 4 was kind of a step back.. well except it had darth vader so it was okay :p