This is a short theory I came up with and it's what I want to happen in the new episodes.
So, in the promo Blue and Yellow Diamond are meeting Centipeetle and in one of the bingo posts it says, "Corrupted gems get healed" which might mean that the diamonds will heal the corrupted gems.
Also the diamonds have no way back to homeworld since their ships have been destroyed so maybe White Diamond will come and take them back.
Since the diamonds now know that Steven is Pink Diamond, they will try to take him back to Homeworld with them and won't befriend the Crystal Gems after all.