I like DBZ, especially Tenkaichi...But I dont know how many time we will continue to buy (year by year) a new Fighting game with DBZ.
Raging Blast looks really good with the original music of the mangas...but I don't know if there's an interest to play again ?
Piccolo revenge is also a good idea to refresh the serie but this games looks too repetitive.
Here the preview of Raging Blast : http://www.lemagjeuxvideo.com/focus/preview-dragon-ball-z-raging-blast/
I will perhaps wait Raging blast "2" to play with all the characters (DB GT is not include into Raging Blast).
...and Wait the first review !