http://www.dailytech.com/Surface+Pro+2+May+Target+8+Hour+Battery+Life+With+Haswell/article33311.htm
If they can get decent performance and battery life I would consider it for a laptop replacement.
But the pivotal question remained what to do about the power-hungry Intel chip. It appears Intel has sold Microsoft on the idea of a Haswell brain for the Surface 2. A recent analysis by AnandTech showed Intel making serious power-efficiency gains with Haswell, with a projected battery life of 8 hours with a 42.5 Wh battery. Of course these numbers were based on Apple's OS X and iOS -- but they suggest that if Microsoft does its homework on the firmware front, their may be hope that the Surface Pro 2 fixes the abysmal battery life of its predecessor.
The Surface Pro 2 is also expected -- according to Neowin -- to pack a "refined" kickstand, improving on a popular feature in the first model. It's also expected to bump the memory to 8 GB. TechRadar reports that other Surface Pro 2 rumors point to NFC, wireless charging, an LTE variant, and 802.11ac Wi-Fi support.
If they can get decent performance and battery life I would consider it for a laptop replacement.