Actually not. Only the new UI is explained in detail, but nothing substantial can be found there. I guess what he wanted to know was, what's new in Lion "under the hood". Will it hog resources like Leopard back then, maybe be as swift as or even swifter as SL? Will there be new OpenGL drivers, to name but a few questions that matter for those who don't care about the UI. I can happily life with or without full-screen apps, Mission Control, Launchpad, and whatnot, but will gladly upgrade if Lion is a big step forward in the undocumented features, i.e. source code.
Nothing trollish about wanting to know what's beneath the surface. There are people that use Macs as production systems, after all, not just for exchanging pics and videos and facebooking.

(present company excluded of course)