Apple could launch Mac OS X 10.7 Lion as early as 14 June, according to reports.

CEO Steve Jobs will officially unveil the company's next-generation operating system at the WorldWide Developer Conference today and according to 9to5Mac he is set to spring a surprise by setting a launch date of Tuesday 14 June.

According to the report, several sources have named a 14 June launch date, with Apple Stores due to change their window displays and other in-store signage.

Apple will remove boxed copies of Snow Leopard from the stores too, according to the report, though will not replace them with Lion boxes, as Mac OS X 10.7 is likely to be primarily delivered through the Mac App Store.

Mac OS X 10.7 Lion has reportedly been undergoing internal testing at Apple since May, with several developer previews being released in recent weeks.

Apple's Lion: A marriage of iOS and OS X

All should be revealed later on Monday when Steve Jobs addresses WWDC. You can follow all of the announcements live on this website.

Live feed: WWDC 2011 keynote address