We don't know, we haven't seen numbers released. But generally on any closed system (sealed hardware) is 3 to 5 years, good rule of thumb is the life span is how ever long you can get a warranty fro the OEM. So with the Surface 3 years is a good bet.
The price for the Pro is inline with equivalent Ultrabooks and they are generally expected to last 3 years.
The price for the Pro is inline with equivalent Ultrabooks and they are generally expected to last 3 years.