The Game Guide features four illustrated chapters detailing what World of Warcraft is, getting started with the game, basic game mechanics, very detailed visual representations of game and chat etiquette, and an entire section explaining the late PvP and raid game. It is truly a sight to behold, and the people in charge of visualizing and explaining some nebulous concepts have gotten it right in a simple and aesthetically pleasing way. It's really awesome. But the game guide doesn't stop with describing the game alone.
The new race and class pages up the ante on player race information, detailing the story of each race, capital and starting cities, faction leaders, and the story so far. Each race's page is lovingly crafted with gorgeous artwork and awesome story bits. The class pages are just as robust, with lore on the various classes, role descriptions, and more. Blizzard had a lot of fun making these pages, and it shows.