Not anytime soon... Well unless you count the NGP and the 3DS.
new xbox will be released in november 2013. i feel it in my soul.
PS4 will be released november 2014. My guess is they would rather wait one more year, but will be forced to go in 2014 or lose too much ground to MS.
The only one im not sure about is the Wii2. I would say november 2013 for that one too, but i don't know if they will go toe-to-toe with microsoft, whichever company announces their new console first (E3 2012) will get the pick of the date, the other company will release 6 months after, so i guess spring of 2014.
i'd say that there is a much higher chance that MS will announce first. And, as I said, it's going to be a surprise announcement at E3 next year. This year is going to be more garbage for kinect etc, nothing exciting at all, and the gaming media will begin speculating about new consoles, setting up fanboy expectations for the 2012 announcement so there won't be a big backlash of "too soon".
You'll all know I'm going to be right when after this years E3 we start seeing articles in the big press (gamespot, ign) about when the next consoles will be released.
mark your calenders.
An internal document by MS has revealed they plan to launch the next home console in 2015.
PS4 will probably come around 2015, 2016 as well, after the 10 year life cycle of the PS3.