Captain America being released by Fox depends on if there has been any other big-budgeted Marvel features before this point. If no other character has received the blockbuster treatment, then Fox is cool. However, if other Marvel stars have been adapted by other studios, I'd suggest to find another studio.Buena Vista
The Fox and the Hound (Disney)
Raiders of the Lost Ark (Fox)
Captain America (Fox?)
Time Bandits (Hyperion)
The Thief and the Cobbler
Oh, and as for Richard Williams's passion project? Good luck, UA. You'll need it!
Also, when will we get the next part of the debut of Walt Disney Home Video?