Valve's brilliant first-person puzzler Portal has just been updated. Not normally a big deal, but when that update adds a new, mysterious Steam achievement and some hidden radio transmissions and this is Valve we're dealing with, we're right to be curious.
Today's Portal update, officially, features the following addition: "Changed radio transmission frequency to comply with federal and state spectrum management regulations." Not officially noted there is the new Steam achievement "Transmission Received" which goes undescribed by the developer, but involves the use of Portal's in-game radios.
Also included, as spotted by Steam forumgoers are a bunch of new sound files, all prefaced with the word "dinosaur." According to members there, those sound files feature Morse code encoded transmissions.
While we have no idea at this point what Valve is planning—the Steam mob is currently pounding away at a solution and Morse code experts are encouraged to join the fray—we wouldn't be surprised if the Half-Life and Left 4 Dead developer was planning a Portal related announcement. If it were to announce Portal 2, we wouldn't be surprised. If it were to announce a sequel to one of its games in its own game, we'd simply be impressed.