Haswell mobile CPUs are likely to be released some time between April - June 2013. Not definite, but likely.
Yes I read April 2013 for Haswell, with some Haswell-based products coming out a little sooner. That still leaves time for a mid-life spec bump to the current Ivy Bridge lineups. There was speculation Apple would bump the 15" MBp Retina at the same time that it announced the 13" but that didn't happen. I'm assuming that if they don't bump the specs by mid-November then the current lineup will remain until Haswell hits the scene.