Update: Review for this book is now available
Found out there's an art book for Metal Gear Solid 4 that's just out. The few page previews from Amazon Japan look pretty decent.
I'll be getting it so stay tuned for a more detailed review in the near future.
Here are direct links to the book:
Amazon Japan | YesAsia USA | beNippon.com | CDJapan.co.jp | Play-asia.com
If you buy from the link, I get a little commission that helps me get more books to feature.
Here's Amazon Japan shipping rates for your reference.