Apple is hosting a Back to the Mac event tomorrow, October 20th at 11am mountain time. This teaser picture is the only thing we get as far as what to expect from Steve Jobs tomorrow, but my guess is that it has something to do with OS X. Dissecting the picture above it appears to be a lion behind this Apple logo, and if we know anything about Apple it's that they love to name their operating systems after cats, big ones. So a fair assumption would be that they are introducing OS X Lion 10.7. Along with it there has been far-fetched rumors of a much needed MacBook Air hardware update, and even further fetched, a touchscreen iMac. All just speculation of course. Click the source below to check out what else Engadget has to say on the matter, and if you'd like to watch it live, head there! They always have very good live coverage of all Apple's events on their liveblog.