It's like he's apologizing for the quality of the cover art. "Wait, wait! Please just stick around, I promise it's much better than this cover implies. In fact, I'm pretty sure whatever the hell's going on here isn't even in the book."
As you know, May the Fourth isn't the only holiday this weekend. Free Comic Book Day is tomorrow. Earlier this week, we got a preview of a free Firefly comic. Now, we have a panel from tomorrow's Buffy the Vampire Slayer comic where she appears to be up against a xenomorph.