There are some who believe that the Mac OS X Leopard will be released some time around May. How do they come up with this predicted release date? These are some hints:

• At WWDC 2006 (August 2006) Steve Jobs announced a "Spring 2007" Leopard release
• Apple executives continue to highlight a "Spring 2007" release
• The latest Leopard Build (9A377a) was released to Apple Developer Connection members on March 4, 2007 - buzz in the Apple community is that the release is far from stable and not ready for release
• Steve Jobs's WWDC speech indicated Leopard had several "Top Secret Features" that could not be announced until a later date
• Macworld 2007 (January 2007) didn't disclose any "Top Secret Features"
• No details of any top secret features have emerged since then
• Mac OS X 10.4.9 Tiger has been released

Aside from these, some other factors that say that Leopard will be released in May: Spring begins March 21, and Summer begins June 21. In short, Leopard will be released between these two dates, given the "Spring release". The release dates of Leopard books also happen around May and June.

And lastly, iPhone will be released at the WWDC 2007. The darling of Apple products deserves a strategic release date, and many think that the release of Leopard will not coincide with the release of the iPhone.