The Valve Linux blog has been updated with the announcement that an internal Linux beta will begin next week and a private, external beta for 1,000 users will happen at some point in October.
“The private external beta will include:
It will not yet include:
For existing Linux users, the external private beta is a good release for seeing where we are in running our games on Linux. We will be using a sign up page for the external beta. Information about the sign up will be announced in a future post.
For those new to Linux, we recommend waiting for a subsequent release where more features are implemented along with improvements to the user install experience.”