Either A:They find new hosts so that naruto and killer bee(if hes still alive) can train them to become perfect Jins or B: They all become united with naruto(aka Juubi jin..).. I think choice A is the most likely one.
shukaku, gyuki and kurama will stick with gaara, bee and naruto resp. coz of their bonds.
I think other bijuu will all be left in peace, now that they are good to humans (atleast to naruto and may extend that), what say you?
I think either theyll all be with naruto and hell stay the juubi jin. Or SOMEHOW theyll all be safetly extracted and go free livingside by side with the shinobi. Though i hope not. I just feel like theyll get some sort of cheesy happy ending.