I received a copy of Snow Leopard in the mail so that I can move my MobileMe account to iCloud. A Snow Leopard 10.6.3 DVD and a thick multi-language Software License Agreement booklet are packed in a brown padded envelope.
I personally will move my MobileMe account at the last moment possible because I still have some Macs that will never be able to run OS X Lion ever. Namely the PowerPC based Macs. In the meantime, I have been using a different iCloud account since Summer 2011.
Apple is committed to keep MobileMe service until June 30th, 2012.