According to WinBeta a new build of Messenger 6 has leaked onto the internet.
No changes in the interface at this stage and looks like it has only fixed a few bugs. Nevertheless it's leaked and expect regular updates to Messenger 6 from now on as well as glimpses of MSN Explorer 9.
Note: MS have asked us not to supply download links so please respect that. Comments will be moderated.
Screenshot: Previous MSN Messenger 6.0 Screenshots
News source: WinBeta