I'm NOT joking. It seems someone hacked FFIIj from the ground up. Graphics, music, EVERYTHING from FFX for the NES. It's in Japanese though.
Check out the screenshots here:
http://www.usamimi.info/%7Eff10fc/pc/scene.html
It's downloadable here:
http://www.usamimi.info/%7Eff10fc/pc/game.html
Someone needs to translate this into English.
EDIT 2 AND HALF YEARS LATER OMG!
I came across a webpage that compiled all the screens and all the beta files together.
http://www.compmike19.com/id461.htm
If the above link expires, the old Japanese site is now on the WABACK archives. So you can at least see screens
here
I also uploaded the files to Megaupload:
http://www.megaupload.com/?d=DJXOASBV
If the above link expires feel free to PM me. I have the files now, and don't plan on deleting them.