That disc was called Collection 1 so you assumed wrong. v( '')v
From what was said before in this thread I understood that he is composing everything as it goes (as in not repeating music in the show?). Then again I'm not watching the anime and every track on the first collection has a title (unlike say GOD EATER which was M01 etc) so maybe it's just that he really recorded a ton of tracks. Either case, I won't be surprised if there's a 3rd one and maybe 4th, lol.
I enjoyed the series but it is too slow paced. The movie seems like a good way to hyper-speed the story and cram it down our throats Fate-style, the slow-buildup in the series is literally mind numbing. They have trouble explaining literally anything about the plot and character backgrounds but that might just be a shortcoming of the original authors.
IMO, the manga isn't much interesting until that spider family appears... The appearance of the Hashira and upper moon made it better, and from now on, the story is just more fun. I guess that the anime would be more intense in the next season as well.
Some big names in Shounen Jump are also slow starters that aren't intersting until they reach vol. 5-6... Bleach and Rurouni Kenshin were like that. I remember that in Bleach case, the publishing in Thailand hadn't cared about the series at all and they hadn't bought the license of Bleach until the shinigami captains were revealed in the story.