Recently Phil Spencer tweeted the following:
The 'and' portion separates the subject of contractual agreements and keeping Call of Duty on PlayStation.
In other words, future Call of Duty games not already bound by contractual agreements.
He says he had good calls with leaders at Sony, so they've seemingly been discussing a deal to keep those future CoD games on PlayStation.
Personally I have no interest in Call of Duty, but it's an interesting topic.
My question to you is not what you think Sony would trade. But rather what you want them to trade?
And it doesn't have to be realistic.
(Although you can answer what you think they would trade as well.)
For example, I don't think CoD would push Sony to accept Gamepass on PlayStation. But I would like it if they did.
Though what I would probably find the most interesting is if the agreement is to have some Sony games on Game Pass.
Imagine God of War Ragnarok, Day 1 on Game Pass. :)