Yes, the Team Fortress 2 Beta is coming to Linux. An update was pushed out on Monday with changes being made as the Linux client of the Valve game nears reality. There's some launcher changes and other alterations needed specifically for the Linux client.
Initially I wasn't going to even write about this, and now refer to this as "ho-hum" while many Phoronix readers continue to send in emails about this as they are leaping for joy, but it really isn't a surprise. While Valve's first Linux native port was Left 4 Dead 2, this was just the start as I have been writing about for many months.
When everything is said and done, you should see most -- if not all -- of Valve's major Source Engine titles available from their Steam Linux client. With the Source Engine now in good shape for Linux, plus the Linux cabal being larger than when their Linux efforts engaged in full steam, it's much easier now bringing their other popular titles to Linux. Seeing all their major titles on Linux is also especially needed for a Linux-based "Steam Box" gaming console.
Things will hopefully be ramping up soon. Next week we should hopefully hear some more details along with beta news likely being on the horizon.