Mountain Lion, or the marmite* edition as it will probably be known, is set to be released today. Not a massive update, but only £13.99-ish.
As part of its quarterly earnings press release, Apple has confirmed that OS X 10.8 Mountain Lion, the latest version of its desktop operating system, will be released via the Mac App Store today. Priced at $19.99, Mountain Lion brings a number of elements from iOS to the Mac with new features including Notification Center, expanded iCloud support, Reminders, a revamped Messages app, and more....
....Apple has also detailed each of the 200+ new features you'll find inside the OS starting today. When the moment does finally arrive, you'll need to be running either Mac OS X Lion or the most recent version of Snow Leopard (10.6.8) to upgrade.
Don't forget if you bought a Mac after 11th June, then you get a free update via the Up To Date program.
iMac (Mid 2007 or newer)
MacBook (Late 2008 Aluminum, or Early 2009 or newer)
MacBook Pro (Mid/Late 2007 or newer)
MacBook Air (Late 2008 or newer)
Mac mini (Early 2009 or newer)
Mac Pro (Early 2008 or newer)
Xserve (Early 2009)
*If you like iOS you'll love it. If not, well...