Well, episode 29 answered all the 'why didn't Champa wish for..' questions. That, and the earth is in imminent danger now if they lose.
I'm pretty sure btw that Beerus is playing with Bulma and basically sending her on the Super Dragon Balls hunt in universe 7 for some reason.

Next up: who will they choose to fight in the tournament?
Piccolo seems a no brainer from the preview and a sound choice, but I doubt Gohan would be very useful atm. Gotenks would seem like a good replacement, but that would be practically cheating since it's a fusion. Buu is too stupid to play by the rules, so he's out.. and below that... Android 18 seems to be the strongest... or Tien. It would be absolutely hilarious if they took Mr. Satan for shits 'n giggles