Hi Thorsten, I'll try to answer your questions as best I can. First of all, you should know that most of this list is fake, as previously stated in this thread, but the likelihood of Disney making a lot of these films are pretty high. Okay. Here goes-
High School Musical 2- I've heard from quite a few sources about this, so I know that they are definitely making this movie. It's an obvious move from Disney considering how popular the first was/is and how much money they can stand to make from it, ie DVDs, CDs, etc. I myself bought the DVD yesterday and I got a free poster with it!

I've also heard that all of the cast is coming back, so that's good news.
That's So Raven Movie- I've heard that Disney was originally planning this for TV, but are now planning it for a theatrical release, seeing the popularity of a theatrical release of The Lizzie McGuire Movie. I think that al of the series cast is coming back, but I don't know for sure if everyone's coming back for the film. Not sure where they are in development, but hopefully they announce more information soon.
Some Call It Magic- I have no idea what's happening with this movie. I never heard of it before I saw this list, I don't know of the storyline and I don't know who's starring in it, but it's very possible that Aly and AJ could continue their Disney domination with another DCOM. They only thing I know for sure regarding the film title is that Raven Symone (That's So Raven) has recorded a song under the same title. That means that her song could possibly end up in the finished film, if Disney ever makes it.
High School Musical 3 and
The Cheetah Girls 3- Very, very possible, considering Disney's love for sequels, and even more likely if both sequels are successful and popular, but for now just consider them rumours.
Zenon- Z4 - I really don't know about this one, considering Disney has already completed the trilogy quite nicely, but you never know. I think that Kirsten Storm would probably come back for a fourth installment, but I think that she's getting a bit old for the part, although Disney might have been holding off releasing a box set of the DVDs for the fourth movie. It would be a perfect release for them, but for now, definitely file it under rumour.
Tiger Cruise 2- I think that this one is a definite fake, considering the first one kind of flew under the radar for a lot of people, and wasn't really popular, but I think that Hayden would return, if asked, for a sequel. But considering that Disney hasn't even released a DVD of it, I wouldn't believe this one until more sources confirm it.
Cadet Kelly 2- Very unlikely, considering that Hilary hasn't been in contact with Disney for awhile, and I doubt that they'd make a sequel without her, being that she is pretty much why the movie is popular among tweens. Don't count on this one, well not yet anyway. I can imagine Disney years from now trying to make as much money from previous movies, and I can imagine them getting like a forty year old Christy Carlson Romano headlining the sequel.
Halloweentown : She's the Witch - I think that Disney is actually going ahead with this one, cause I've read it in a magazine and online a few times, so it's pretty posiible that this could end up as a real film. I've heard that it could also be called Halloweentown 4- Witch U, as they are heading off to Witch University. I hate that title, but you know, the movies were popular, so Disney could still be trying to milk it some more. I've heard that Lucas Grabeel (of High School Musical fame) is retunng as well.
I hope I've answered you questions Throsten, maybe some other people can give you more info on them. Wow, I'm really tired from typing that much.

Enjoy!
-James