Has anyone heard about a change in routes for Trams #1 and #2 around the Ringenstrasse? We'll be there in Dec.
This should help you out.
http://www.wienerlinien.at/wl/ep/home.do?tabId=0
I only know that Line 1 & Line 2 now have extended their routes and merged with former lines. I doubt it will have much effect on the inner city stops.
If you go up to the Rick Steves Guideooks part of this website, and look under Germany and Austria, someone from a hotel or pension in Vienna has posted all the changes.