Fungus Forest (Beta World)

One of the many beta worlds from Banjo Kazooie and probably the one with the most info. What appears to be Banjo in a forest on the wall of his house is said to be the unfinished world, Fungus Forest. Early screens and videos of BK showed Banjo swimming near Clanker but in a very green enviroment. A tune is played that is not heard anywhere in the game but it can be found inside the game's code. Many also say that this mysterious world was moved over to DK64 where it was changed into Fungi Forest. So what do you think a out this beta world? (I'll post screens and videos soon) 
I haven't even heard of this stage before. :p

And where's those vids, SZ?!?!?!