I need to rewatch the presentation when it becomes downloadable off GT or something, because I got called away during the driving game and didn't get back until Square-Enix stepped up on stage for a grand total of 5 seconds.
Overall, I'm very wary about this console. It sounds like everything I don't WANT in a gaming experience: constantly online, constantly linking you with other people you don't want. Add backwards compatibility apparently only via Gaikai Onlive-style streaming and the total lack of firm details about the non-spec aspects of the hardware or OS, and you have a console I'm not sure I actually want. Streaming trials for every PS4 game is a great idea, though.
On the other hand, the games looked rather promising. Knack looked like a potentially-cool Ratchet & Clank-style cartoony brawler. The new Killzone looks like it's taking a page from Crysis with some huge environments and very shiny models. The new Infamous will probably be pretty decent as well since it's Sucker Punch. As for the rest, I either haven't seen the footage yet or I'm very "meh" on it. Giving Jonathan Blow any time whatsoever was a terrible idea, and following him up with the equally pretentious David Cage won't do me any favors on the replay either.
Like I said, though, I saw this conference in bits and pieces. I need to rewatch it as a continuous presentation to get a real sense of it and judge Sony accordingly.
Fun fact: did you know Twitter has a daily Tweet cap? I didn't until today.