The 5 original ideas for hotels were the Contemporary, the Polynesian, the Asian, the Persian, and the Venetian. The Asian was the only one that came close to being constructed until recent rumors about Disney having plans to build the Venetian. For more info on the original resorts go here:
http://tikiman2001.homestead.com/poly1.html
Here is some info from WDWMAGIC:
5 May 1999: News in from inside WDW, thanks John.
The Venetian is not between the Contemporary and the Lagoon. That area is now called "Contemporary Shores" and was the site of "Rock and Rockets" last year. The Venetian is just out of the Transportation and Ticket Center monorail station, at about pylon 20 or so. It would be another monorail serviced hotel, although I'm not sure exactly where the station would be.
25 April 1999:
The long rumoured Venetian Resort may finally see construction start soon. This is to be Disney's flagship hotel, and will aim to reach the 5 star status narrowly missed by the Grand Floridian. It's location is on the Seven Seas Lagoon.
Thanks to Chuck for the following description
While taking a tour of the Fire Headquarters in Disney, I happened across a large blueprint that was titled, DISNEY'S GRAND VENEZIA RESORT. One of the firefighters described it as being "The new hotel across from the Contemporary, in the open field. It's supposed to be bigger and fancier than the Grand Floridian."
Steve