Of course it is "undesirable" to launch after your competitors, the thing is, MS will (probably) launch the next xbox late 2012, and IMO, Sony is not prepared to launch this early. If they release in 2012, MS is going after the Wii audience while maintaining the hardcore relationship they built, not allowing the Wii U to be alone on the market.
Once again I say the problem with the PS3 was not that it came 1 year after the 360, the problem was that Sony didn´t show a superior machine. The machine was cool, the experts said that it was a superior console, but the GAMES didn´t show that.
My predictions says that Xbox will do everything to release the next Xbox in 2012 and go hard in the paint with kinect 2.0 and go after the huge casual market, while still being a hardcore machine with Halo, Forza, Gears, etc.
If this doesn´t happen and MS releases it in 2013, then it is pretty easy to predict that Sony will release the console right after.
I think it is pretty set in stone that Sony will release PS4 in mid to late 2013, the next xbox is the wild card.







