As far as I know they are not developing H元 now for several reasons, among them the mo-cap issue.
Responding to fans in the comment section of his blog, Lowrie wrote, 'Right. He has recently revealed his knowledge of all things Half-Life 3 in the comment threads of an old blog. Half-Life 3 isn't in production at Valve right now according to one of the studio's regular voice actors John Patrick Lowrie, who also happens to be married to the voice of GlaDoS Ellen McLain.
