I posted this before but were you aware that The Little Mermaid- Platinum Edition on disc 2 has the knee cap scene in the Hans Christian Anderson feature? It's non animorphic but others here have said it looks better than the old limited issue dvd. And Little Mermaid has not yet gone back into the vault, Alladin just did but it's been out for a while.
Ultimatedisney.com is a good place to look around.

About Song of the South. The best version is definitely the BBC 2 broadcast. The Hong Kong laserdisc is unsubtitled but the picture is very washed out compared to the Japanese one. And there was some work here on putting together something good. I really wish I had heard a more recent update from this.
http://www.originaltrilogy.com/forum/messageview.cfm?catid=11&threadid=4346&highlight_key=y&keyword1=song%20of%20the%20south
One eBay auction for a vhs tape claimed it was NTSC but dubbed into French. I've never heard of such a release. I did recently come across it in segments on youtube. The picture quality looked really good, both source and lack of youtube compression.
http://www.youtube.com/watch?v=47ak4vjiNzw&feature=related

By the way, I live about 30 min from a huge independent video store that sells a ton of laserdiscs. They have a lot of the Disney ones. I saw the Lion King deluxe edition for about $35. I'm considering seeing if I can get a laserdisc player just so I can buy and watch Beauty and the Beast.

There's a whole section on Snopes.com about the supposedly dirty stuff in disney films.