Sony will ride the vita + ps3 connectivity for at least a year and a half before they show ps4.
microsoft very well may have their console here in 2012 holidays.
But nintendo should just wait to release it at the same time with microsoft, just make sure you have a STRONG launch lineup, unlike the 3DS.
https://www.youtube.com/channel/UCbchUmHiEvZ1m3b9HgW5syg
VIDEO GAME MUSIC MASHUPS