I think we'll see the console, get the final name, tech specs, and some game announcement teasers before E3 but we won't see any games until E3.
yeah im hoping they do it like wiiu/360's initial unveilings where they hit some major bullet points but they don't go into any specifics. ie:
-here's the design
-(MAYBE) here's the controller
-here's a handful of game studio logos that are supporting it
-(MAYBE) a few game titles here and there, but they would be obvious, like KZ4 and 1313
-here's a cool feature that PS3 didn't do that we want to be a focus of the PS4 (for example, the rumored tablet device that takes your games with you)
-here's another but less amazing feature like the one above (like eye2 and/or split-apart DS4)
-PS4 is going to be the best forever yay guys hooray party hard
then at E3 show game trailers, demos, titles, brief hardware specs, details on features they want to focus on, PSN briefing, PS+ briefing, and a release window. not expecting a price.