I feel it's obligated by Bandai/Tamashii that we get the "full set" of incarnations for DBZ's hero Goku! I mean, why not?!?!
Since 2013 gave us Regular Goku and a re-issue of Manga SSJ Goku, and 2014 is giving us Vegito, I don't think we'll see a new Goku until MAYBE 2015.
The question is...how would they do SSJ2 Goku? Simple enough to re-use the body molds they have, but tossing in some new hand sculpts and faces is a MUST. Perhaps they could add some energy effects/ki blasts? I'm looking at this BUSINESS-wise.
Something else to do...if Regular Goku and SSJ Goku are STILL readily available, would be to make SSJ2 Goku have a battle-damaged body. It simulates his damage from his fight against Majin Vegeta, and gives a "new" Goku for everyone to pick up as opposed to everyone just trying to get a SSJ2 Goku head. It's also incentive to go back and buy another SSJ or Regular Goku.
If they release Majin Vegeta, it's likely people will also want SSJ2 Goku to go along with him. Much like we have the Android trio and fans want Nappa to go with Scouter Vegeta.
My other ideas:
-Figuarts Goku "Ultimate Pack": Features the standard Goku gi body we have, but includes all the other head sculpts, faces (Reg., SSJ, SSJ3) AND is the only unique way to get SSJ2 head. Clever marketing ploy I've seen other toy companies use. Throw in a lot of the old and add one unique, new item that EVERYONE wants.
-Figuarts DBZ Ki & Face Pack: Unique SSJ2 Goku head and faces, along with some Ki and Energy effects (like lightning to wrap around the characters). Though we haven't seen Tamashii release packs like this for the DBZ line...