Someone has requested more pictures/information on the Finding Nemo Submarine Voyage (mentioned in my last update), so I have decided to dedicate an entry to the future attraction.
Name: Finding Nemo Submarine VoyageLand: TomorrowlandOpening Date: June 11, 2007Based on: The 2003 PIXAR animated movie Finding NemoStory: Guests will get up close and personal with some of Nemo's most beloved characters, including (of course) Nemo, as the friends observe an underwater volcano.Submarines: The attraction will use the same submarine vehicles as the now-defunct Submarine Voyage, although they have been given new names, numbers, and paint job. The new names are as followed: Nautilus, Scout, Voyager, Mariner, Seafarer, Explorer, Neptune, and Argonaut.

Finding Nemo Submarine Voyage fills the spot of another underwater themed Tomorrowland attraction, the well loved Submarine Voyage. Closed on September 9, 1998, the attraction was promised (by then-Disneyland president Paul Pressler, nonetheless) to open in 2003 as a new, updated version. Not surprisingly, though, 2003 came and went with no new submarine attraction.

Finally, much to the joy of Disneyland fans alike, Walt Disney Parks and Resorts president Jay Rasulo announced on July 15, 2005 that a new attraction, named Finding Nemo Submarine Voyage, would be built in the original attractions place.
Picture credits, in order: Disneyland.com, DAPs Magic, and chrisaustx.smugmug.com for the last two construction pictures.