We know the cities/continuities involved in Convergence, and while each doesn't seem to offer a Superman, I've come up with a list of 13 I think are the most high-profile. My list doesn't include all (Generations, Flashpoint, New Frontier, a few others) but I think these are the biggest to watch.
Which will become sacrificial lambs on the Multiversal altar, a la Kal-L in Infinite Crisis?
EDIT: I realized after making this that the current Earth-1 won't be featured in Convergence, but who knows? We might get a few surprises despite the city guide.
Earth-1 (Pre-Crisis) (includes Red/Blue, other variants)
Post-Crisis
Pre-Flashpoint
Earth-2
All-Star
Kingdome Come
Pre-Crisis Superboy
Red Son
Earth-0
Earth-1 (current)
Tangent
One Million
Injustice
Other/none of the above
All of the above