Timan
Developer
http://www.apple.com/macosx/mountain-lion/
http://www.theverge.com/2012/2/16/2801047/mac-os-x-10-8-mountain-lion-preview-photos-video
http://techcrunch.com/2012/02/16/os-x-mountain-lion/
iMessage, Reminders, Notes, Notification Center, Twitter integration, Game Center, and AirPlay Mirroring.
This summer, dev preview TODAY
iMessage Beta - http://www.apple.com/macosx/mountain-lion/messages-beta/