Apple is sending out invites for an event to be held October 20th, where the company is expected to show a sneak preview of its next version of Mac OS X. Sources are suggesting that perhaps Apple is going to call the next version Lion.

Beyond the sneak peek of the new version of the OS, rumors of a new Air, Core i3 13” MacBook and new and high-end graphics support could be on the agenda. Our best guess is that the new MacBook Air is possible for an announcement, but we think the i3 13” MacBook offering is a lot more likely to be announced.

Until the 20th arrives, we expect the Apple rumor mill to go into overdrive trying to figure out what Apple might show. It seems the only sure thing is a sneak peek at the next version of OS X.