Hey guys,
I just got home from my first day volunteering at the Tamashii Booth and it went really well! Figured I'd give you a little update before I go back to bed and do it again tomorrow morning haha.
I was able to ask some of the questions you guys asked and surprisingly they answered quite a few. The biggest thing I gathered was that there's a lot more that goes into which figures they decide to release than just fan requests. There's a ton of market research, R&D, etc that they must satisfy before going ahead on a final figure decision.
Which leads me to Nappa. They're not sure they are going to release him actually because he is a very large figure that requires a lot of tooling which would drive the MSRP way too high...especially for a character that is not nearly as popular as the other saiyans.
They said the saiyans are the most successful figures in the line which is why we primarily see them over all other characters. They actually have MANY prototypes created already but haven't shown them because they don't know which one's to put out yet. We are more likely to see a Vegito, Gogeta, Majin Vegeta or even a SSJ4 Goku(!) over a buu first. Villains aren't as popular in Japan which plays a major role.
They are waiting to see the results of the NYCC poll to see how the east coast fares against the west coast's SDCC poll to determine the future of new characters.
They are very interested in releasing a Goten and Trunks 2 pack! And in regards to the overall success of the line, it is one of their most successful lines out there and isn't going away anytime soon. So just be patient guys. There are tons of characters to get to unlike MMPR; it's just a really involved internal decision.
I would guess the reason the androids weren't there was because it's still up in the air what to do with them. They just want to show the definitive releases which as of now ends at Goku. They also mentioned that they just wanted to get this normal Goku out now since they've been showing him for 3 years already. It would have taken even longer if they had chosen to go with a different gi/sash.
Hope that answers some questions.