It'll just be Steve/Tony, and the Avengers already recognize that that's what'll make them happiest, right? Although they'd be down about the lack of a party, probably!

Ooh, it would be! I think it's partly because Ults!Tony is probably the most closed-off/distant of the Tonys and is so deliberate with his facade and it definitely fools Ults!Steve! So, it'd be really interesting for Steve to meet another Tony who's more open and vulnerable and have to reconcile that with the Tony he knows. And of course, Tony having to deal with a harder Steve who's more blunt with his words. Man, I love the multiverse...