I haven't physically seen one, or seen any online previews anywhere (other than the cover).
I ordered one online at Booktopia (Australia), it was 25% off when I ordered, plus it was free shipping - use the code FREEBIE (no idea how long the code is valid for, I placed my order a couple of days ago). Here's the link to the book:http://www.booktopia.com.au/mad-max-lee ... 59037.html
If you're not in Australia, you can get one at Amazon (for about half the Australian price!), I ordered one from there too, I just figured it wouldn't arrive for a few weeks after release date:http://www.amazon.com/Mad-Max-Road%C2%A ... dmaxmovies
A lot of times Amazon also post previews of books, there's nothing on their site yet, but I would check back closer to release date. Otherwise I will post up some info once I have one in my hands.