For those looking for a tough Windows 8 laptop, you might want to take a look at this 1.1kg Panasonic Toughpad FZ-G1 with Windows 8. There is no pricing on the brochure but the specs it interesting.
From the specs, it has a nice 8 hours battery life and surprisingly, the battery is replaceable by user (given that it has a IP65 rating). Here is the specs. Not the full one but enough to get me interested.
I have uploaded the full Panasonic brochure. It has other models of laptops and also special pricing for the Android Tablet FZ-A1.