Oops..
Not including handhelds the PS3 will be #1 this year, so no, it won't be a Nintendo console...unless Ninty buys Sony.
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