The Microsoft Surface 2 is thinner and lighter than the original model and offers improved resolution. Microsoft also upgraded the silicon from the Tegra 3 used on the Surface RT to the Tegra 4 employed on the Surface 2.
The Microsoft Surface RT did not have what you would call a positive sales experience. Microsoft ended up having to take a $900 million charge for unsold units of the slate. Assuming that the Redmond based software giant learned its lesson from the poor experience it had with the first-gen slab, the Microsoft Surface 2 could be a marvelous turnaround story in 2013-2014.
source: MicrosoftSurface MicrosoftNews via WMPoweruser