I think the vita sales are good considering there is no popular Japanese games released for it yet (monster hunter style popular). I thought it would be selling ~4k per week at his stage tbh.
My prediction threads:
Wii U will sell under 40m units (made on 14th September 2012)
PS Vita will sell under 20m units (made on 30th September 2012)
Wii U will sell under 7m in 2013 - I was right