I think the gap is going to dissappear by christmas 2010, PS3 is going to take over big time in sales in 2010. Bold prediction but there you go.
Edit: it has lots of exclusives in 2010 which will push more sofware sales, for example GT5 and GOWIII should give it a nice increase and that is just the begginning.
it's the future of handheld
PS VITA = LIFE
The official Vita thread http://gamrconnect.vgchartz.com/thread.php?id=130023&page=1