Microsoft just released some more information regarding the Microsoft Surface Pro. It is coming in early 2013 and its price is starting at $899 for the 64GB standalone version with a pen, but without a Touch Cover ($120) or Type Cover($130). The standalone 128GB version will be $999.
If you want to know more about Windows RT tablets (b.e. Microsoft Surface) and Windows 8 tablets (b.e. Microsoft Surface Pro) read my previous blog post. It describes how both differ from each other, but also how they differ from Android and iOS (Apple) tablets.