No don't believe sony either - I doubt that Gakai is going to be any better in the real world other than at trade shows where the server is in the same building or whatever , input lag kills games unless they are sloowwww...
I notice a low input response TV in terms of lag, never mind playing over the internet.
Maybe OK for games like tetris or chess and bearable for maybe more strategy games....
Action games would drive me nuts...
I'm fairly certain playing an action games on gaikai will suck ass unless you live close to the data centre. It'll be useful for the jRPG back library but ass for most of the rest. I'm pretty pessimistic on both.