Amazon.com has dates for the next two Dragonball GT DVDs, as well as the second King Piccolo boxed set. Dragonball GT #5 (Baby Saga -- Ramifications) and #6 (Baby Saga -- Preparation) will be released 6/26/03. King Piccolo set #2 will be released 6/3/03.
This does merit some questions. Why are they skipping the General Blue and Commander Red sagas? Are they included in the Red Ribbon Army boxed set?
The next (previous?) DBZ video game "Ultimate Battle 22" for the PS1 is being released in the US on Mar 25. This game was originally released in Europe and Japan in 2001, but never made it to the US. It's similar in spirit to Budokai but includes characters from the Buu saga. Of course, it's PS1 so may seem dated.