PS3 playable at TGS? Didn’t happen. It was quite a disappointment, because Mr. Kutaragi had previously said that we would see such. Reason? Well, according to Japan’s Famitsu magazine:

Sony could have shown playable software, but it decided that since this was the first time the PS3 was going to be shown on Japanese soil, it would be best to show only video footage first. Pressed further by the magazine, Saeki states that SCE wanted general users to feel the same impact that industry members felt upon seeing the E3 trailer footage for the system, and thus opted for trailer footage only , even though Saeki admits that being able to play the games would have caused a greater buzz.

Uh, doesn’t really make sense to me.

Also, that PlayStation Conference in February? It now looks like Sony is planning a different approach to it. Something that will “surprise gamers”.

IGN - Sony Talks PS3