Vita in every PS4 bunduru, sales rocket, best ever handheld takes its rightful place :)
Seriously though, we haven't heard anything about the ultimate bundle with Vita and PS4, so that may have something to do with it, otherwise... I don't know, if we were nearer Feb I'd say Infamous:SS bundle but I don't know, though I suppose its only a month and a bit away...
Also none of these explain why the standalone would go walkies so I have no idea really