I'm highly doubting the truth of skate. 4 but i can see ea banking on the idea of putting out a vita version and with the way the vita connects with the ps3.
Also went a more recent video and the dude starts saying that they talked to a rep and said they interest spiked recently after skate 3 interest started to grow again and the kid announced that they had sparked an interest in the game with we want skate 4 youtube videos.
Think about it, interest would have spiked because they finally fixed the servers.