nVidia doesn't say the Steam Linux Beta starts today, they just say that they have tested their new drivers with the beta. They have probably tested them with an internal Valve steam beta that nobody else has access to yet.
"new R310 drivers were also thoroughly tested with Steam for Linux, the extension of Valve's phenomenally popular Steam gaming platform that officially opened to gamers starting today."
I think that's the correct meaning of this announcement.
It'd be strange to drop such a huge bomb on the election day.
Although I'd be happy if we're wrong.
