The cover should give it away. This isn't the story of Walt Disney World, this is the story of Epcot and everything that attempted to personify the Experimental Prototype Community of Tomorrow as relayed by Walt. It seems, in fact, that Disney-MGM Studios and Disney's Animal Kingdom, neither portrayed in a very favorable light, are mentioned only out of courtesy.
Another issue I take up with this book is Koenig (and having read both Mouse Tales and Mouse Under Glass, I can say I'm a fan of his work) has a really difficult time being objective. The re-occurring theme in this book is how 'big-egoed' Michael Eisner virtually destroyed all that was good about the company with his bottom-line thinking, despite having spent many pages prior to Eisner's introduction talking about how the company as a whole was hemmoraging money left and right. Koening seems to have issue that Eisner took the only profitable division of the company (and yet not profitable enough to keep the company alive) and managed to yield more profits from it. At what cost? Enough to keep the Disney company around. Koenig inexplicably leaves out various items that wouldn't support his findings. How is it possible that a company bent on cutting costs everywhere would constantly be spending more money to revamp attractions, either favorably or not (Koenig harps on the Enchanted Tiki Room: Under New Management, but doesn't explain why it wasn't changed at Disneyland - in fact, under Eisner's reign, Disneyland's went under a major refurbishment to restore the original attraction). The problem with Koenig's reporting here is evident enough: it directly blames Eisner when something happens that he doesn't like, but when something does happen that he's in favor of, it's serendipitous or - in the case of Alien Encounter becoming Stitch's Great Escape -'prophetic' that better things are to come once Iger steps in. Again, completely ignoring that newer attractions such as Expedition Everest happened under Eisner's reign as well. Not to say that Eisner was perfect, but give credit where credit is due. It's just become the popular thing to blame him when something you don't like happens but give out credit like candy to everyone else when something you do like happens.
Ultimately - and still in respect to Eisner - this book reads as if Koenig was expecting (and rightfully so at the time) Disney to gloss over the 25th Anniversary of Epcot. While never explicitly mentioning it (although it wouldn't surprise me if earlier drafts did), he begins digging at it by mentioning how a Disneyland promotion was so succesful, that Eisner decided to milk it by celebrating virtual non-events like WDW's 15th.
This book is an ode to Epcot which happens to cover the Magic Kingdom simply because it's almost considered to be Epcot:Phase I here. All that aside, there is plenty of information to be found here that isn't found elsewhere. It's a decent read. I was hoping more for what one would expect having read Mouse Tales and the few such items that are mentioned seem a tad out of place given the full context of the book, but it's still worthy a read. As long as you forget there are other parks after it.
A much fairer review of Eisner (both good and bad) can be found in books like Disney War, but certainly not here.