I thought they announced Ricochet 2 at E3! (Also, Ricochet is for real moneydollars on Steam, even though I've got non-steam HL patched with Ricochet for free. :/
bluechirri, I agree with you about the "It's probably an idea Valve discussed for HL3 and then discarded when they decided they couldn't integrate it into gameplay, but which Laidlaw was interested enough in that he wanted to explore it in another medium.", but it could go deeper and delve into...