http://www.serato.com/scratchlive/2 (says the bridge will be in scratch 2.0)
So if the release date for 2.0 is late March (which includes the Bridge according to serato's website)....Ableton has been working on this latest beta forever (not complaining take all the time you guys need). Then it stands to reason that by April we should get a look at the bridge after the WMC.