Surely the only boom to having a Youtube app on a Vita is to record and upload game clips directly to Youtube, I couldn't see any mention of that anywhere but I see a lot of exited comments from people on what is essentially something that is already available on PC's, laptops, smart phones, tablets etc. "Oooh yeah I can watch Benton chasing deer and a wig wearing granny on a failing parachute clips sat on the bus without having to get my phone out"?
Really not that exciting is it?
Obviously if it turns out you can record games and upload directly to Youtube then ignore the above.