The longevity of Team Fortress 2 (opens in new tab) continues to astound me. It became free in 2011, but still Valve is grinding out updates (494 patches (opens in new tab) as of May 2015), reaping the benefits of the virtual hat trade. The coming months will be huge for Team Fortress: the long-rumoured competitive matchmaking has been confirmed (opens in new tab), and a Steam group has been set up to coordinate beta invites.
Matchmaking was brought up in a visit to Valve HQ by the community at teamfortress.tv (opens in new tab) in April last year. To their surprise, Valve was right onboard with the idea, but this is the first official confirmation of impending change.
As to the group, Valve says it'll "be using this group to send out announcements related to the competitive beta as well as seed beta invites for the expansion of the closed beta". Get on in there (opens in new tab).