The Idolmaster (anime)/WMG

The anime ends with the Project Jupiter failing to launch in the first place.
The reason is because of the Producer. If you look at it, each Idolmaster game always start with the Producer having his first time producing, thus in 2, the Producer arrives after the Project Jupiter is launched, and Ryuugu Komachi group have been defeated. In the anime, the Producer arrived BEFORE Project Jupiter was launched, thus if all goes well, then the Producer will strengthen Studio 765 and Ryuugu Komachi's reputation so it does not lose against Project Jupiter.
 * Jossed as of episode 10. It shows that Jupiter is doing fairly well as an Idol group.

Yukiho is a Yakuza Princess.
Think about it. Her father has many underlings, is very secretive, and apparently rarely met Yukiho. Either he's operating in another city, or Yukiho is trying to distance herself from her father's ways. Further backing this theory up is the fact that there's a story in the drama CD detailing Ritsuko rescuing Yukiho from kidnapping.

In the end of the anime, Jupiter would defect after learning the much more sinister approach of Kuroi
They, especially Touma, were shown to be disgusted at Kuroi's underhanded tactics. I reckon that they will eventually leave Kuroi for bringing in dirty tactics and not let them beat 765 Pro purely with their power. But they'll not defect to 765, but instead goes to another production company (possibly Elder Records) just so they can compete with the 765, but without dirty tricks.

And hopefully with Jupiter leaving, 961 will end up going downhill, leaving Kuroi in misery for every of his atrocity in the name of what he thought to be his 'superior' way to raise idols.
 * A bit stretching it, i guess. The anime had been relatively faithful to the iM@S 2 canon so far.
 * Confirmed as of episode 21, although whether Jupiter will make another appearance is debatable.
 * They make two brief appearances in episode 24 and 25, starting to get back on track after leaving 961.
 * And karma got a CHECKMATE by Kuroi in the final episode, seeing that he's still well and managed to give one last sucker punch to 765 Pro.

Kuroi is in love with Kotori.
Since both he and the President were friends with Kotori in their school days, it's very possible that Kuroi developed feelings for Kotori, and grew jealous when she seemed to pick the President over him. This, in addition to their differing ideologies, is what spawned Kuroi's bitter rivalry. Hints of this can also be seen at the end of episode 21, where Kuroi frequents the bar where Kotori works part time as a singer. He then quickly leaves in the middle of Kotori's performance, with the President musing that Kuroi is terrible at expressing his feelings.

Ryou's story is an extremely long and complicated Gambit Roulette on his part.
First suppose that the ability to craft an incredibly convoluted plot is genetic. Now consider what a teenage boy would do with that ability. Assuming that Ryou's sex drive wins out over his self-consciousness, he's got a pretty sweet deal going for him (as legions of dirty-minded fan artists will attest).