Gametrailers hit up Tom Chilton for an interview at Leipzig and here's the video. His main point is that Wrath is bigger and better than before -- more, better, cooler content. Intercut with lots of cool video from the beta (though some of it was seen as far back as BlizzCon last year), he lays down what's up with the next expansion.
He says that Wrath is meant for high-end players, but that there's lots for lowbies as well: recruit-a-friend was actually designed as part of the Wrath feature set, and Blizzard thought it was better to release it earlier. Inscription is also seen as a "whole-game" feature, since you can pick it up right at level one, and Achievements will work for everyone as well.
He also talks about how the new gameplay features Blizzard is building in let them do all kinds of things with quests and instances -- he specifically mentions one encounter in the Oculus where you'll get to choose a ride with different abilities, so it'll be a different experience than your normal class play. There's some great footage of air combat in there as well, and even a little tidbit about the official threatmeter. Nice interview, and it sounds like Blizzard is rolling right along with their progress in the beta.