So far it seems that Sony is playing it safe with the PS4, while Microsoft (supposedly) and Nintendo aren't. Well, the streaming isn't playing it safe, but it's stupid.
One thing which kept me from buying a launch PS3 was that there wasn't anything which made me go 'I have to try that'. Oh, and price. I had gotten that feeling with the Wii, WiiU, DS, 3DS and Vita (though the price kept me away from it) though not the PS3, so I just waited for a price drop before jumping in.
I'm hoping Sony reveals something mindblowing, not just a graphical advance and some flashy OS features, since if that's the case, a PC (Steambox?) for my projector room which can play all 100+ of my Steam games is a much better investment personally than a console with insanely priced games.