Along with the new Vista CTP many Microsoft testers are expecting today, there are several Windows Live programs that will be undergoing refreshes within the next week or so.
As I posted after the first Windows Live Session at the end of January, the next build of Windows Live Mail "M5" will be released before the end of this month, however testers can also expect to see the February build of Windows Live Messenger too. A preview of it was given in the form of the private Build 562, however the public version will contain a much improved UI, even compared to 562.
This is just a teaser, expect more from us soon! ;-)