EA has trademarked the sequels to their Battlefield series up to Battlefield 20. Even if there is any legitimate trademark of Half life 3, it doesn't mean we will see that game in a month or two.
loving Tonkka
What? I'm saying that the game will most likely never come out, but if it will Valve would make an HD remake of the older Half life games. Doom 4 is coming out, so they made a Doom 3 HD remake. If that remake comes out we will know that Half life 3 is coming.
Well Team Fortress 2 started development in 1998 and was released in 2007.
I'm pretty sure that somewhere in the developer commentary they say that they spent a lot of time to design a game like Team fortress classic, but then scrapped the whole thing and made it all cartoonish. Half life 3 is Valve's most expected game and a main series, so I'm pretty sure they'd have a much bigger dev team for the game and it would be made much faster.