Wow this is getting real close, In a few days BBM should be completed and out for download on all windows phone devices.
There are three areas core to the BBM experience that you'll find in this app: Contacts, Chats and Feeds. Contacts is a single list where you'll be able to view all BBM contacts (individuals and groups). Chats is the single destination for all BBM Chats including group chats, multi-person chats and one-to-one BBM Chats. Feeds is where you'll see what all your BBM Contacts are up to. Status updates and profile photo changes can be viewed here.
I still cant wait to use this Messenger on my Windows Phone