Whoa there, don’t bust the champagne and party poppers just yet. First of all, save those for New Years. Second, this is all speculation so far. According to Uber Entertainment art director Chandana Ekanayake‘s tweet, while at a local game developer event in Seattle he spotted a Valve employee sporting the shirt depicting a familiar logo with an unfamiliar number. While all know and love the Half Life series and our favorite Theoretical Physicist, we haven’t seen him since 2007. Maybe with the release of Portal 2, Valve has a more stable console version of the source engine to use, and with a new Counter-Strike game coming in 2012 it definitely seems possible.