Book listings on Amazon.co.uk could indicate that Mac OS X Lion will be launched in July or August of this year. The books include Mac OS X Lion For Dummies, Mac OS X Lion All-in-One For Dummies, Mac OS X Lion Bible, Teach Yourself Visually Mac OS X Lion, Mac OS X Lion Portable Genius, and Mac OS X Lion Simplified. All are set to ship in July or August.
Book launches don't always predict Apple product launches, but it is unusual for so many books to be scheduled for release in a short timeframe. Apple has given OS X Lion a loose "summer" launch time. The company most likely wants to focus more attention on the launch of the next generation iPad and iPhone, pushing the OS X Lion launch date back. The OS X Lion operating system will probably get an in depth preview at this year's WWDC event, expected in early June.