Davidjohnson, the German press is hinting that the BBI will open in October 2013 instead of March now and some are speculating that this date will slip as well. However, it is only speculation.
For easyJet customers, the difference in location is not that great as the SXF terminals are just to the north of the runway opposed the terminals of BBI being just south of the (northerly) runway. However, the airline may postpone any capacity increase (if any) until the Tegel passengers are forced down south to BBI anyway.