On July 10th, early in the morning, Atari had announced that the Wii's version of Dragon Ball Z Budokai Tenkaichi 3 will have online play.
In Dragon Ball Z Budokai Tenkaichi 3, there will be over 150 playable characters, over 20 battle stages, with refined graphics making each character's effects more realistic.
Plus, with the Wii's innovative controller, it allows players to easily mimic signature moves and execute devastating energy attacks, just as the are performed in the Dragonball Z series.

Atari is incredibly excited to provide online gameplay for the Wii.
Adding online gameplay for Wii will finally deliver on a feature that fans have been waiting for

Said Emily Anadu, senior product manager of Atari.

With over 150 playable characters and one of the Wii's first online games, I'm sure this game will be a huge success.

Sources: IGN: Dragon Ball Z: Budokai Tenkaichi 3
NintendoWorldReport - News Article: Atari Hops On The Online Bandwagon For Wii

Coolza's Thoughts

If you know the origin of my name, you'll know I'm a big DBZ fan.
I've owned all the DBZ fighter games up until Budokai Tenkaichi games, since those were on the PS2.
I can't wait to see what more news Atari has to for us about this, because 150 playable characters... I can't even name that many!