iFixit really likes to destroy devices, and the Kindle Fire HD 7″ could not escape that fate. They discovered nothing surprising, just the standards. There is an LG LCD panel, a Texas Instruments OMAP processor, and Samsung flash memory. Standard fare.
However, a noticeable change from the previous Kindle Fire is that it was designed to be more easily repairable. For example, they now use a standalone 3.5mm headphone jack to replace it in case it dies (considering it gets so much use). Not only is that good for Amazon (cheaper to repair), but it could be good for enthusiasts looking to do some hacks or repairs themselves. Unfortunately, the enthusiast factor is dampened by locked bootloaders, but that might be solved.