TMW generally does not announce the release date prior to the release. According to wikipedia (http://en.wikipedia.org/wiki/MATLAB) the release schedule has been:
R2006a 3/1R2006b 9/1
R2007a 3/1R2007b 9/1
R2008a 3/1R2008b 10/9
R2009a 3/6R2009b 9/4
R2010a 3/5R2010b 9/3
R2011a 4/8R2011b 9/1
R2012a 3/1
So I guess from this history you can expect it the first couple of days of March/September, but if it doesn't come by that first week it could be a while.
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