Just after the servers went down, they posted an update on www.playrust.com, explaining what was going on. The website is now down as well, but I will try to explain what it said. I might have missed some of it, but maybe someone else can fill in the gaps.
New features and fixes:
Fixed zombies no-clipping through things.
Fixed something about wildlife floating.
Added one or two new shotguns (http://www.youtube.com/watch?v=atoAAzWkHMc)
Made all weapons much harder to craft.
Added new cliffs/cliff models.
And last, ALL servers were wiped.
Edit: website is now back.