They would have taken all of Nintendo's steam away if they had just announced a long term plan to have future games take advantage of the Vita as a controller. Hardcore Nintendo fans love to claim Nintendo is so revolutionary, but they are a generation behind with their Wii U idea.
Sony announced a LBP2 DLC that would allow the Vita to be used as a controller. Touchscreen, touch panel, gyroscope, all of the Vita's features will be usable. This is something that smart people picked up on some time ago, but if all future must have titles took advantage of this, why even buy a Wii U? If Sony had announced a PS3/Vita bundle and confirmed that developers would make compatibility between the two the norm, then Nintendo would have been in the middle of the ocean with not much to make it to shore.
Me personally, I was let down by what Sony showed at their conference. I'm also a little surprised that they either don't see the opportunity they have in front of them, or that they are just too stupid to know it's there.
BTW, this isn't a dig at Nintendo. I'm just stating my opinion.