I'd welcome Bo if he became a more serious character. Instead of puking, have him spill wine.
Far left shadow is Baraka, the second to the right looks like Fujin to me, and the far right shadow is Bo Rai Cho, I can't seem to recognize the second to the left, but it seems like it might be Sareena.
I'd be very disappointed if we won't get Reiko, but Fujin has to be included, also I'm not quite sure if these shadows are just placeholders or not, it would not make sense for them to just hint so much towards certain characters only to completely swerve us, but its pretty lame that I can already tell who these characters are...
Sindel, Bo Rai Cho and Fujin are some of my most "I couldn't care less" characters in the series. But I would gladly welcome them if it meant I got my Tarkatan back.
This may all be a troll, of course, because this Boon RT suggests the person might have guessed the silhouettes. The implausibility of Bo' Rai Cho aside, it's impossible for me to believe they'd do Sweet Tooth or Master Chief right now even though both have been rumored in the past.
I don't think that suggests the silhouettes are a troll at all. Boon's just teasing that those guesses could be right, he's done the exact same thing before with past teases.
I could totally see it being Baraka/[SindelOrFrost]/[CyborgOrFujin]/BRC, but after that Boon tweet I feel like it's more likely these are joke silhouettes and we won't see Baraka or BRC in the actual KP2.
With Baraka my major question is how the variations would work. Reptile's are pretty bare-bones, for example, but his concept lent itself to a little more outside-the-box thinking. Baraka's got, like. The blades. That's about it. He can do cool stuff with them, but what would the variation difference be? Rain and Sindel, of the NPCs, are much easier to imagine with three variations.