Apple has used the WWDC keynote -- the one part of the conference that's open to non-developers -- to pull the sheet off new Macs, although the .

Mountain Lion's release date is still an Apple secret; the company has only said it will ship the upgrade "late summer."

A June roll-out contradicts that timeline by at least a couple of months, but Apple has been known to beat its release estimates. In 2009, , at a minimum days, at a maximum weeks, before the September target it had set earlier.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at , on or subscribe to . His email address is .

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