You could always catch Catclysmitis tomorrow. :) I've read there's not going to be the usual downtime, since the separated out the code changes into the patches that have already gone live, so it's just turning on new content.

But really, it doesn't matter. I might get up a little early and make my new Worgen, but it'll be there waiting for me when I'm off of work. The neat thing is so many new things to do, but it'll be over a year before we get the next expansion, so no need to do them all right away.