I am not surprised by this news at all and it fits entirely with my prediction that Nex-Box will launch winter 2012. All the evidence points to 2012 and the idea of it coming in 2013,2014 is insane.
This recent leak confirmed that the Nex-Box began development in 2005, that is obviously true. We also know 343 hired staff to work on a Next-Generation title in 2008 when they began work on Halo 4. Other developers and publishers have been doing damage control for almost a year now because leaks suggest early dev kits have been in their hands for awhile now. Microsoft stated prior to 360's release that a huge part of their strategy was based on getting to the market first, they stated if they allowed a competitor time on the market unchallenged it would be a fatal mistake.
So launching in 2013 wouldn't fit with what we know right now. We know Microsoft has had the Nex-Box in development since 2005 there is no reason to doubt that it is ready for the market next year. We also know internal development on next generation software began in 2008, that means Microsoft already had a good idea what the hardware would and was capable of. With the leaks from all over saying kits are in developer hands and have been for nearly a year, launching in 2013 would be foolish. Then add in Microsoft's fundemental strategy launch first and don't give a competitor time on the market unchallenged, it would be completely out of question to give Nintendo a whole year head start.
As for the specs, Microsoft and Sony are both going for a cheaper profitable console this generation. With the success of Wii Nintendo proved you don't need a massive improvement to sell new hardware. The hardware leaked is more then enough to justify a new generation even if we assumed the rest of the specs aren't going to have any surprises.
Microsoft would be insane to give Nintendo a year head start. They would be even more insane to produce a high end console which they sell at a loss. Even further insane to hold off the software they already have assuming they began development in 2008 as they claim then they must have several titles ready for launch, something Nintendo doesn't even have. Microsoft's best chance at being a success next gen is to crush Nintendo in 2012 while bringing in the profits to survive the rest of the generation!