Looks like it's a Microsoft day today! Just spotted this piece of MSN Messenger 4.7 news from Msnfanatic.com!

Microsoft plans to introduce an update to Windows Messenger with the release of Service Pack 1. "In order for Windows Messenger to be hidden and removed, we had to make changes, and that's manifested in (version) 4.7," Cullinan said. "Also there have been some security issues (in Windows Messenger), and those will be addressed also."

So its not out yet... but im sure someone will leak it... or it might just go public before we go mad being crashed.