I'd like to find out too, I feel like a nostalgia trip.
From what I've heard it plays just like all the other games, except with more characters, meaning all the characters operate almost exactly the same as eachother, barring size (for example a great ape won't be phased by being punched in the shins by a midget, though they will take damage and in return they swing slower, but they do more damage).
They also say it's "like being part of the show". The thing is that almost every reviewer is comparing it straight up with Street Fight, Mortal Kombat and Tekken, expecting every character to be completely different and somehow balanced out (even if you like those games you have to admit there is always a character and combo combination that blows everything else out of the water) which DBZ:UT does not.
Make of that what you will.
