Apple "Back to the Mac" Event Oct. 20: New OS X and MacBook Air?

Is that a Lion lurking in Apple's invite for a "Back to the Mac" event on October 20? It looks like a brand new version of OS X. I hope they call it Simba. But what else?

The surprise could be a revamped MacBook Air. At least, that's what Daring Fireball thinks:

A "sneak preview of the next major version of Mac OS X", and, I'm just guessing here, the brand-new way-cooler MacBook Air.

The other update that is long overdue is iLife. However, it seems unlikely that they will introduce a new Mac OS X (which will take at least one hour to present), a new "way-cooler" computer, and iLife. We'll find out a week from today.