Discussed and answered many times already: an update for KLAS is surely planned, but it has a lower priority compared to a JFK update. Since we first updated Zurich, then KORD, the next should be JFK, so it's should be quite clear we are going in chronological order of release, with the older sceneries being updated first, so KLAS should happen after JFK.
Of course, nothing will start for JFK, before we release CYVR.