The anticipated completion of Phase 1 of the Silver Line metro is in November, 2013. Phase 1 runs from the existing East Falls Church metro to the current final stop at the Wiehle-Reston East Metrorail Station. Even with completion there will be multiple things remaining like obtaining certificates of occupancy and a lot of testing of systems and rails. The anticipated start date is January 2014 per the current WMATA budget.
If you are looking for a home near the new metro stations, please look at our earlier post.