Mountain Lion will be available in July for $19.99. That's even cheaper than Lion, which set all kinds of records according to Apple (26 million copies). The upgrade (at that price) will be available to current Lion and Snow Leopard users, and free to anyone who buys a new Mac as of now. The features are well known, but Apple also announced the addition of voice dictation, Airplay mirroring support (up to 1080p resolution), and Power Nap, which keeps your Mac up to date when it's in sleep mode (that includes getting software updates, backups, queuing notifications and more). Twitter will be available at the OS level (meaning developers can build tweeting into their apps). And Gatekeeper lets users control the sources apps come from, for more security (let's hope IT administrators can somehow lock this down on behalf of users). In the next few slides, we'll detail a few other OS X features.