Which, if any, of the major console game developers also develop for Android?
How did you search for the publishers? Electronic Arts, for example, most certainly has applications in the Market. I only see one Square Enix game, though.

Beyond that, the Xperia Play will be supported by a line of Playstation titles. They're already starting to hit the market, in fact. I wouldn't recommend purchasing them unless you own an Xperia Play since I have no idea what running them on a non-suported device would entail (or if it's even feasible - I'll leave that to XDA), but it's another angle to it.

Whether or not they'll continue to update them or develop new games...I could only speculate, really.