something spoilers don't say but I know that it will happen. if its true about them joining with britannia then you just gotta know whats gonna happen.
britannia is going to use them to catch lelouch, and after they have all of the obk will be executed. I haven't heard what toudou does but it is probably up to him to decide if many japanese will betray or stay with lelouch.
should they stay britannia will fall. should they betray they will be used and executed. it is as simple as that.
I am looking forward to seeing who is stupid enough to leave lelouch.