The background download for the pre-expansion patch should be coming to your launcher soon. This does not mean that it is ready - there may well be several additional downloads for it prior to it being live - however, we're getting closer! *excited*
Yay, I see I have the Legion Beta available now also :)
To play it or not to :p
Ooh that's a hard decision - they're probably hoping you help with the stress test incoming ...