The next batch of shell colours scheduled to be released are Black, Pink and Purple. This has been confirmed by Funtastic Australia, yet it would be safe to assume that they will be coming to America as well. The next set of 6 figures will also be releasing with the new shells.
The new lite figures for the new Tama-Go shells in my opinion will most likely be Kuromametchi, Chamametchi and Violetchi.