I'm ridiculously excited -- this could mean more pictures, interviews, even videos. Tumblr is a great platform to share media with fans, and as the Ansible pointed out, Lionsgate/Summit know how to pull it off well.
And we only have to wait until tomorrow! I think Orci did us a huge favor by not announcing it a week or so in advance.
Looking forward to it? Anyone have any ideas of what sort of content we'll be seeing? :)