I could see half of the 747's go or perhaps all of them. It depends on what the contract with Emirates is. But TNT can probably get rid of all the 747's and still cover the Emirates contract with the remaining 777's if they can't get out of it.
If UPS takes over I can't see them wanting to keep TNT Airways. A dozen or so 146's and 737's ain't much capacity and it's just down the road from Cologne.