Supported Devices:

MacBook Pro:
MacBook Pro (Aluminium) Late 2006 or later
MacBook Pro (Unibody) Late 2008 or later
MacBook Pro (Retina) Mid 2012

MacBook:
MacBook (Polycarbonate) Late 2006 or later
MacBook (Aluminium Unibody) Late 2008
MacBook (Polycarbonate Unibody) Late 2009 or later

MacBook Air:
MacBook Air (Aluminium Unibody) Early 2008 or later
MacBook Air (Tapered Unibody) Late 2010 or later

iMac:
iMac (Intel) Late 2006
iMac (Aluminium) Mid 2007 or later

Mac Mini:
Mac Mini (Intel) Mid 2007 or later
Mac Mini (Intel Unibody) Mid 2010 or later

Mac Pro:
Mac Pro (Cheese Grater) Mid 2006 or later

Initial Release: 10.7.0 (July 20 2011)
Latest Release: 10.7.5 (October 4 2012)

New Features:
- iCloud
- Dropped support for Rosetta
- Dropped support for PowerPC Applications
- First 64-Bit only version of MacOS
- FaceTime
- Launchpad
- Improved multitouch gestures