IMO, going to Gamescom, the least Sony should do is at least validate all the non-1st party studio PS4 works-in-progress, like the Stardust HD spiritual sequel, and all the other devs who has publicly came out and said they're working with Sony on a PS4 title. (launching in 2014, of course)
It's understandable that Sony will want to hold back on the big-guns from their AAA-teams, but at least give a name and presence to the 'more-than-indie' titles that they're publishing. Similar to MS's highlight reel of games they showed for mere seconds. Those are the kind of titles that will go under the radar anyway midst the noises of the AAA-titles from 3rd-party and 1st-party, even if announced later rather than sooner.