The more time passes, the more people will talk about Half Life 2 Episode 3, everyone's hyped for it, it's been a lot since the last HL2 game.
Sometimes i wonder if HL2EP3 will be released. HL2EP2 left a giant hope for a sequel, because of the ending.
Maybe that was their trick, make us hope there would be a sequel but, there is not?
Maybe HL2EP3 won't be released, or HL3 will release first, and HL2EP3 will come out at last. Maybe what supposedly happens in Borealis could affect Freeman's mind and making him in the progress of HL3 can't remember it, and that's when the game finishes and HL2EP3 comes later and tells the story.
It's all a giant puzzle, i can't really know what Valve is going to do, nobody is able to unless someone works at Valve tell us what they are doing.