Well I'm close to beating the game now, so here's a bit of what you can expect -
- In the Heaven/Kai Tournment you just fight Pikkon. But you get the treat of watching some of the battles before you fight Pikkon.
- Janemba is indeed the offical name used in the game and he appears very early in the game after Goku goes to earth for a day. You won't fight him for yourself intil much later.
- All the characters special attacks can gain levels and become stronger, but use up more ki. You can adjust your attacks levels from 1-3 whenever you want. Ex.- At level 3,Goku's Instant Transmission allows you to target three oppenents/objects, compared to level one which limits you to just one.
- Broly is in the game as a "mid-boss" so to say
- There is a lot of equipment you can get, including rare equipment only certain enemies will drop. There is also weighted equipment which reduces your walk/run+attack speed, but raises the amount of exp you get.

I always wondered about that...

Killa gonna git ju sucka!

What in the HFIL!?

Sadly, its all he can say

But Vegeta...your already dead!
I don't wanna spoil anything else about the game, but its been a blast, and I am sure there are a couple secrets to discover.