*shrug*.. I wouldn't know how much they can squeeze in all the story line into a single movie, so I won't be expecting much..
However, anyone interested in this, though- you can try reading one of the project worker's non-profit fan-fictional work based on FFVII story line. The author is the guy who is supposed to write for this Web Series according to him.
The story, while still work in progress, is quite interesting read. If you have time that is, though. It's 144 chapters and 382,690 words in total currently. Keep in mind that it was written 7 or so years ago and author was a teenager, though.. Author is quite good in writing, even if I don't know how good the author would be in movie script.. They generally do go around together.
Not one of the best fan-fiction work based on FFVII I have read, but definitely one of the most thoroughly and canon data-based work, trying to fill up all loopholes.
The story start:
http://www.fanfiction.net/s/3122672/1/The-Jenova-ProjectRegarding the project The Web Series, Author (Xander a.k.a. Mr. Ite)'s note :
http://www.fanfiction.net/s/3122672/144/The-Jenova-Project