http://www.bmrf.us/
(Turn your sound down, your ears can thank me later)
It's a Black Mesa evacuation order for the area of new mexico, there's also another site that cropped up http://www.blackmesasource.com/
And there's now also a blackmesa steam workshop page.
Obviously people are going crazy and expecting this to be half life 3, what i really think it's not looking at the site it appears to be the half life remake release on steam.
While neat for them to promote it also rather cruel seeing how people are waiting on half life 3.