Update: Sorry all looks like a false alarm. Mea Culpa. It seems like it was simply showing the user that they have the Beta Zone version of BBM Installed.
It looks like RIM has started rolling out BlackBerry Messenger 6.0 in App World. We know that RIM has a 24 hour cache in App World so it could take a bit to get to you but the process has started. BBM 6 is a big deal because it opens up the Social Platform API to developers for them to tie into BBM with their apps. It will lead to some really "sticky" apps easier app discovery.
You should be able to find BlackBerry Messenger 6 in App World at this link. Thanks Gokulesh for the screenshot!