I think the most you'll see from DB is a Kid Goku. While from GT you'd likely get SSJ4 Goku & Vegeta and MAYYYBE a Kid Goku GT if we're lucky. The Tamashii Buddies line has a kid DB Goku and SSJ4 Goku in it. I've been collecting Dragon Ball Gashopon as well and GT is quite prominent...more so than original Dragon Ball characters.
But Tamashii has already said there will be a focus on the Buu Saga since Kai will start showing that in Japan soon. So it makes sense to release characters that coincide with what's going on in the TV show...this is smart marketing that I think Japan sometimes struggles with since they don't tend to coordinate well. Most American companies make sure the cartoon/movie toy products coincide with the current cartoon TV shows and movies. Oh well...
But Tamashii has already said there will be a focus on the Buu Saga since Kai will start showing that in Japan soon. So it makes sense to release characters that coincide with what's going on in the TV show...this is smart marketing that I think Japan sometimes struggles with since they don't tend to coordinate well. Most American companies make sure the cartoon/movie toy products coincide with the current cartoon TV shows and movies. Oh well...