Hi Karen! Welcome to the DIS!!!
This is a great place to exchange ideas and information and everyone is very helpful!
One thing to keep in mind though...it seems Disney changes their policy on things quite frequently, so always confirm any information given here with your coordinator.
As for your question, the intimate package has changed just recently so you may want to check out this thread too:
http://www.disboards.com/showthread.php?t=1037300
All of the information I have is based on our intimate wedding in September, so the info might be a little outdated (especially considering the changes noted in the thread above).
Disney photographers exclusively use digital film. I can't remember what our photographer told us, but the resolution on the images is VERY HIGH! They are, of course, professional grade. All of your photos will be originally in digital format.
DEFINITELY pre-order the proofs, it's the most inexpensive way to go. The proofs are just regular prints of all your images (no "PROOF" printed on them anywhere).
When you get your proofs/pictures/album, Disney will send a low-res CD of your images. They are small and I wouldn't try to print anything from them. You can email them and post them on your own website, but that's about it.
To purchase the HI-RES CD, it was $1000 at the time of your wedding (or a few weeks after), or you can wait three years and get it for about $100 (unless you are a UK bride, then you get the HI-RES CD with your photo package). I'm waiting three years (just 2 and half more to go!

)
You can scan the proofs, but again, depending on the quality of your scanner, my guess is, you wouldn't be able to go too much larger than the 4x6 they provide.
With regards to the MK shoot, I'm sorry but I'm not sure about that. I would think you would be able to purchase those proofs as well, but someone else might have that answer, or, just ask your coordinator.
Hope that helps!