the vids were test renders.
the stages u can unlock are :
House of pekara
Lava Shrine
Moloch's lair
Sarna Ruins
DragonFly
and Palace Grounds.

not all ideas were implemented into the final version.

did u get my message nindz if u did think it over and contact me over msn messenger

Like everything else, ie. stage fatalities, extra fatalities, some other shit, they probly just didnt have the time. Or if u see character concepts, they were just rejects...after all u can't have an MK like this with TOO many characters and arenas, thats what ultimate/gold type games are for.

I still believe that another stage is still hidden the game... but as time goes on... my belief in that decreases. But if theres going to be another stage, I always thought of it to be The Swamp (Swamplands).

That stage seems to have the most renders, videos, etc that isn't found yet. The stage is also in the GBA version. but hhmm... like everyone else said, it's very possible (and probably is true) that they didn't have time to finish the Swamp.