Since this morning, and before Paris, Berlin or New York, the Austrian capital benefits from the delegation by ICANN of its own TLD, .WIEN, into the root. The domain name <nic.wien> does currently redirect to the Registry’s page http://www.punktwien.at.
According to PUNKT.WIEN, the Registry, it will be sufficient to candidates to .WIEN domains to evidence economic, cultural, historical, social or any other connection to Vienna to be deemed eligible. Which is a rather broad spectrum. The same criteria should apply to the use of .WIEN domain names.
Sunrise dates (and fees) will be known later.