The heavyweight division is too thin already. There aren't enough talented fighters to make HW 205-225. So that one for sure wont happen within the next 2-3 years at the very least.
The Strikeforce guys, we just have to wait and see. We will know in another few weeks everything about that. Some of them have complicated contract issues to work out, so even if Dana wants them, it might not be easy to get them. Melendez is for sure coming over, we know that one for certain. Manhoef isn't really UFC material, and probably wont get a UFC contract. Gegard is a difficult deal for the UFC to work out. I am sure the UFC wants him, but Gegard might be demanding a TON of money to work with them.
Dana wants GSP vs Anderson Silva after Nick Diaz, but he can't guarantee it. But Anderson Silva is the plan right now if GSP wins.