Ura Zelda was the Japanese title, directly translating to 'Next Zelda' I believe.
I suppose even that could be a misinterpretation of what Ura Zelda is, in calling it Next Zelda. Seems to be more of an Expansion Zelda than Next. Next almost seems like they are referring to a completely new game. Or, as I would theorize, next would be referring to next quest. As in, a second quest, much like the original Legend of Zelda.
I think I've come to conclusions and this is what I thought was part of UraZelda...
--A Second Adventure with Re-Arranged Dungeons (Masterquest).
--Expansion of the Mask sidequest including the Gameboy Camera thingy (Was confirmed before in an article) Feel this is what spawned Majora's Mask.
--New Areas, New Charachters (to an extent). I think Nintendo exagerated this a bit and I think this was directly related to the Mask sidequests. The new charachters involved the mask trading. I'm uncertain about New areas, but perhaps just expansions of current areas. I don't think they did so much in the way of creating entirely new landscape with this addition.
I think their would be a re-arrangement of the overworld items a bit as well.
Overal though, I think the main story was completely unchanged from Ocarina of Time and all the changes were strictly to change the gameplay only.
I suppose even that could be a misinterpretation of what Ura Zelda is, in calling it Next Zelda. Seems to be more of an Expansion Zelda than Next. Next almost seems like they are referring to a completely new game. Or, as I would theorize, next would be referring to next quest. As in, a second quest, much like the original Legend of Zelda.
I think I've come to conclusions and this is what I thought was part of UraZelda...
--A Second Adventure with Re-Arranged Dungeons (Masterquest).
--Expansion of the Mask sidequest including the Gameboy Camera thingy (Was confirmed before in an article) Feel this is what spawned Majora's Mask.
--New Areas, New Charachters (to an extent). I think Nintendo exagerated this a bit and I think this was directly related to the Mask sidequests. The new charachters involved the mask trading. I'm uncertain about New areas, but perhaps just expansions of current areas. I don't think they did so much in the way of creating entirely new landscape with this addition.
I think their would be a re-arrangement of the overworld items a bit as well.
Overal though, I think the main story was completely unchanged from Ocarina of Time and all the changes were strictly to change the gameplay only.