I think it's about time that lonely planet went back to it roots. This book, unlike older "shoestring" titles, certainly doesn't seem to be geared towards people travelling on a tight budget. I have used Lonely Planet guides for trips around SE Asia, Europe, Australia and New Zealand. Usually they're great. Usually.
This edition however, regularly suggests accommodation over (often way over) $100 per night. Doesn't include any useful information about overland border crossings and doesn't really have any information on free things to do in areas.
In Mexico it lists only the price of the most expensive bus line, ADO (often double other very acceptable companies like Oriente).
It also needs proof reading, regularly rooms that are doubles are listed as cheaper than singles (when clearly it is intended to be the other way around) and the same with bathrooms/shared bathrooms. There has also been a restyling of the chapters, and now a lot of the useful information for certain countries is listed at the end of a chapter, or in the directory at the back of the book (not particularly handy if you're on a kindle or other non hard copy). Also, for the Kindle and E-reader versions, the new light colour scheme of the book, which is ported directly from the hard copy, makes maps virtually unreadable, and thus useless - especially when compared to the previous edition.
On the plus side it still has a basic guide to lots of regions, and will often list at least two budget places per destination (out of about 6). It has great advice on local food as well, but nothing that you couldn't discover yourself from just asking a local or just walking around. It also has relatively up to date prices on attractions, but again, for the most part, if you want to go to Chitchen Itza, you probably already know it's going to be relatively expensive.
Also, if you really wanted to fly from small town to small town, throughout central america, a significant amount of the "Getting Away" section, often over half of this information will be dedicated to airlines instead of cheap, budget local transport (ie. bus, collectivo, boats).
All in all, it feels very much like LP has forgone the whole "Shoestring" thing, and is instead aiming to make it a condensed guide to the entire region (regardless of budget), and it also feels like its been rushed out (with plenty of mistakes) to make a bit of extra cash for the high season in Central America.
End summary: major disappointment, I'm just glad that i didn't get the actual book, because then id be travelling around with a useless brick for the next 3 months.