This is the full Windows 8 version of Surface. The other version – Surface RT – is built around a similar but different operating system tuned for ARM processors. Surface 8 Pro is built on an Intel Core i5 processor, and the software supports traditional Windows applications, something Surface RT does not. While it's called a tablet, it has that keyboard so it really behaves as a traditional laptop. Because of that fuller feature set and heavier processing power, it is likely to cost more than Surface RT. Microsoft says it will ship 90 days after Surface RT, which will give Microsoft's hardware partners the chance to launch their own versions of Windows 8 laptops before they have to compete with the Microsoft model.