I'm currently awaiting my copy of Infernal Relics from FedEx, and I'm already thinking about whether or not I want to get Rook City. However, I think I would only want to get it if I could get a printing with the updated wording. Is there an updated version of Rook City, or would I have to reference the errata document when using it?
As far as I know, the Enhanced Edition is updated for Rook City :) At least, Rook City already uses the (H) mechanic, has art on environment cards and the nicer card quality of the Enhanced Edition. I don't know if further improvements were made when creating the enhanced edition that are not (yet) in Rook City.
I'm pretty sure they still have Rook City boxes from their initial print run earlier this year (and haven't needed a so make any further printing yet), thus a box ordered today would be identical to a box ordered at lauch. That said, I don't believe there have been any cards neededing rewording (maybe one card, but I can't remember), and they have the same design and quality as the Enhanced Edition and Infernal Relics (in fact, it was the design and quality of Rook City that had them make Enhanced Edition the way they did).
There are several misprints in Rook City, but I don't think there's currently plans to "enhance" rook city with updated cards that fix printing/editing errors. I didn't think there were any erratas for Rook city though...
LCinn is essentially correct - Enhanced Edition is just the core game updated with the changes we made for Rook City :)
Even if we eventually get to the point where we'd reprint Rook City, we wouldn't make substantive changes (like we did for Enhanced Edition).