It's too hard to predict what'll happen with Conor and Jose. I have to see the fight first, and obviously it depends on who wins. It also depends on whether Edgar wins, or whether they want to give Conor a Lightweight title shot right away if he beats Aldo. I guess they could also do a Faber fight or a non-title fight at Lightweight, but I don't think they'd be at UFC 200. I think a rematch between McGregor and Aldo is unlikely. Something particularly controversial would have to happen to make that fight go down.
Holm/Rousey 2 could happen at UFC 200. We'll probably find out how realistic it is once Rousey decides what she wants to do, and speaks to the UFC or the media.
I think Silva/Belfort 2 happens in Rio UFC 197, not UFC 200.
Jones/DC 2 could happen at 198, 199, or 200. We'll probably have to wait until the new year for DC to decide when he wants to fight again.
A GSP return is possible for UFC 200. If he decides to return at all you'd think it'd either happen at that event or in Canada.
I think we'll get a MUCH clearer picture of what'll happen at UFC 200 in January. By that time, Rousey and DC will probably have decided their next moves, GSP will have done his test training camp thing, and McGregor/Aldo will have happened (if the "Little Brazilian Weasel" shows up).