UPDATE: Guess what! Gamescom are now saying that Half-Life 3 and Dragon Age 3′s appearances on the list was “a mistake”, according to Eurogamer. Although they won’t say how that mistake happened. Also, Lamda Generation heard from Valve (a rare treat) saying they weren’t showing any games this year.
Another Half-Life 3 confirmation rumour? Why not. T3 have spotted, on the Gamescom pdf designed to show press what games are appearing, the Half-Life 3 is listed as Valve’s entry. You can see it for yourself right here.