We already got my wish: elder evils and things from beyond the stars.
I love steampunk, but there is some seriously good stuff in this realm from 3pp. Kobold Publishing's Free City of Zobeck will whet your appetite and someone is doing a whole steampunk AP that promises to be excellent. The first installment is free. Plus, with Starfinder, I don't think this is a route Paizo will be taking for quite some time.
I second the return to Tian Xia AP. There seems to be enough fan love that this might just go, especially if you can find a Paizo designer who will support that fan base.
And I'm really not a Galt fan. Sorry, but Vive La Revolution just doesn't justify a whole AP to me. A good single adventure I'd agree with, and it would make a lot of people happy.
We're also getting the underwater AP and we got pirates, which are some of my other favorite things, so I'm pretty much satisfied.