Just come back from there. Pretty ambigious in person too. We missed it, but there is a priority route that delivers you right at the entrance door. It didn't appear that large or particularly quick when the airport was dealing with large number of people returning home from skiing holidays. We took the normal route and were through pretty quickly.

Passport check (I seem to remember) was at the gate or immediately before.

The lounge is nothing to write home about, but I imagine nicer if not as packed as when we were there. Rest of airport pretty basic too, but staff were incredibly pleasant (as you'd expect in Austria).