Even if they did have Ishgard on the release slate as a surprise, I'm not going to get my hopes up too high for it. At this point, we've had so long to think about what's beyond the walls that whatever's there is bound to be at least a little disappointing. I'm sure SE's not going to let it be the Duke Nukem Forever of city-states or anything, but the bare-bones brick structures we've seen in the Ishgardian fortifications and throne room make me hesitant to hope for anything too aesthetic (unless they actually went for Rapture Bar, which, no, I have not given up joking about, yet).
Maybe the Ascians brought them some technological ideas to spruce the place up a bit.
Anyway, yes, the next patch is all about Shiva so you can bet Coerthas is going to be the main area we're hanging out in, and it's the last of the basic six primals so hopefully they've got some great reveals planned leading up to the final patch before expansions hit!