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A source of OXM has just "let it slip" that they've recently been recording lines for Half Life 2: Episode 3. Uhh, what?! Valve, of course, has not confirmed (or denied!) that a new Half-Life game is in the works, but since fans of the series have been clamoring for more since Half-Life 2: Episode 2's release in 2007, it wouldn't be too surprising.
The source of course didn't give any insight on the dialogue that he recorded, or what character he was playing. However, since he's recording the dialogue in the first place that might mean that Valve may be close to finishing the game, as dialogue is generally recorded in the later parts of a development cycle. Who knows?
One thing we do know is that Spike's VGAs are scheduled to happen tomorrow night, and a few Valve employees are said to be attending. Perhaps, since this is where quite a lot of games are being unveiled, Half-Life 2: Episode 3 may be making an appearance as well. We can always hope, at least, but as of now nothing has been confirmed by Valve.