https://www.oebb.at/en/neuigkeiten/streikankuendigung
If you are arriving at the airport in Vienna, then plan to take the Airport bus, a taxi or an Uber.
If you are using the train in Austria tomorrow to travel between cities, you are outta luck. Westbahn is also affected as the signalers will also strike.
Buses, trams and subway/Ubahn in Vienna will operate as normal.