There will be no new Half-Life in 2010 according to the February edition of Game Informer magazine. Specifically they said: “Everyone wants to know when the next installment of Valve’s Half-Life is coming out, but answering that question isn’t easy. Loose Talk has learned that there won’t be any game from the franchise in 2010, and what will finally come out is still unknown. Will it be Half-Life 2: Episode Three? Or will it be a full-on Half-Life 3? If it’s the latter, we suspect that it might be a few years.”
Source: Game Informer Magazine
Valve announces Portal 2 via Game Informer following an in-game patch to Portal that included a new “Transmission Received” achievement that led to an epic alternate reality game (ARG). Half-Life fans’ excitement turns to disappointment as another Valve game is announced while their wait continues.
A lambda shaped vein and a “3” shaped hand is visible in a Team Fortress 2 Saxton Hale Comic from 2009. The graphic also says a few things that could hypothetically apply to Half-Life: “All your questions answered!”, “The comic the government demanded we publish!”, and “The comic they told us should be Free!” [as in Freeman] These could all be coincidences but after years of no official information, it’s easy to see things that may not really be there.
Source: Saxton Hale's Mail Storm