Please stop with "it's not a good time", there is no such thing as a bad time to announce an game.
Maybe if there was a war or such, but even then video gamers would find a good opportunity to have some "hope".
Also, there are 3 ways DBZ and SC interact with each other:
1. DBZ players don't like SC, so they don't care about SC news
2. SC players don't like DBZ, so they don't care about DBZ release
3. Players like both DBZ and SC, so they'll be happy with DBZ release while waiting for SC
It's nonesense to believe that news for a game would be dulled because another game of the same genre is being released...