It's big for a tablet - 10.6 inches, so a lot bigger than many comparable devices. It also weighs 1.5 pounds, which many users find too heavy although it is only slightly heavier than an iPad. It has a keyboard with the option of a touch keyboard cover or a type cover, and a kickstand at the back with a 22 degree angle.
There is a video port, 2.0 USB port which you can use to share files and photos, and a cover port making it suitable for both work and leisure, as well as additional storage space. There is 2 GB of RAM, which is unusually large for a device of this size. A camera is included and you can also use the Surface for films and Xbox music.
You can find more information about its features here. As the tablet is now on the market, you can also find plenty of product reviews if you type 'microsoft surface tablet' in a search engine.