This one's a bit of a stretch… but then, what am I talking about? It's never a stretch when it comes to Valve.
People are already parsing the video that the company showed at last weekend's Spike Video Game Awards show, in which the Portal 2 character Wheatley put in a humorous, short plea to the audience to A) give him the "Character of the Year" award and B) help him get home.
This being a Valve video, viewers are convinced that the video also contains clues to the studios inevitable (but maddeningly mysterious, eternally unannounced) follow-up to Half-Life 2. Found via Rock, Paper Shotgun, this 1/2-speed video helps to parse whatever clues there were in the 30-second video.
For starters, Wheatley ends his speech by saying "one, one, one," which of course adds up to… three. Also, the text in the video reads "Observation Satellite "Lanthanum," which (apparently) is Greek for "To lie hidden." It is also a medication for use helping those with kidney disorders, and is a chemical with the atomic number 57.
It could be a reference to just about anything, including Wheatley himself ("lying hidden"), but as RPS points out, the first letter of "Lanthanum" in Greek is indeed a Lambda, otherwise known as the symbol for Half-Life.
Hmm. Seems like a stretch to me, but then again, why the heck else would they choose to include a greek word beginning with "L" in their video? Oh, Valve. How you taunt us.
Source: Rock, Paper Shotgun