And waiting for the anime is useless. I mean, how it's going to be shown in the anime would be according to how the animators interpret the manga, so one way or another, we won't know what Kubo really wants to show us. :p
According to Bleachexile.com info on the 4th movie is out (you might have to scroll down to see the post, but I have it quoted). I put it in spoilers, because not released in America yet, and I think some people might want to be hidden from the info:
Official Website: http://www.tv-tokyo.co.jp/bleach/
Animation Production: Studio Peirrot
Release Date (in Theaters): December 4th, 2010
Summary: "HELL". is the place where a person is sent to who committed violent crimes when they were alive. SHINIGAMIs are forbidden to go there. One day prisoners revolt and make their escape to the KARAKURA-town where Ichigo and his friends live in. Ichigo and his friends are defeated one after the other by prisoners with overwhelming power. A mystery man appears ("KOKUTOO) who comes to their rescue. With Kokutoo leading the way Ichigo, Rukia, Uryuu, and Renji marches into HELL to save the world.
Now an endless, desperate struggle breaks out between Ichigo and his friends with the TOGABITO!
Well, I'm somewhat disappointed that Hell will only be an anime movie, as opposed to an entire arc, but Kubo's overlooking it, so it's canon.
I'm interested to see what the plot is, and I'm almost certain that the music and animation will be near top-tier as Bleach usually is with big things like a movie.
I liked the trailer, because it showed how the animation works, and it looked really nice too. Though, like pretty much everyone else, I wished it showed more of what's going to happen.