does somebody has this proto,because i have many nintendo magazines and old copies claim that magic koopa was replaced by donkey kong

Interesting information guys, maybe DreamTR owns this one.

From what I understand, both are true.  MagiKoopa (a.k.a. Kamek, or the wizard koopa) was a playable character, though it wasn't clear if he replaced Donkey Kong or if Donkey Kong was in the proto and there are just no pictures of him.

As for the feather, it makes sense to remove it.  Really it was almost a "patch" item to do something that you couldn't normally do in a Mode 7 SNES game -- jump your character. Once the game was translated into a truly 3D format, jumping became a non-issue and, as was pointed out, actually created more problems than it solved in terms of glitches.  

'Course the jump sometimes created glitches in the SNES game too -- the error correction was just better.  Remember when Lakitu had to "fish" you out of areas you couldn't be in?  That was game error correction.

Here you go.   Pre-release footage:

http://www.youtube.com/watch?v=-kuKixC-gWs

Short clip, so don't hesitate to use the pause button.

Oh, and since NOA put it on the N64 promo tape (that's what the clip is from), odds are there is a complete pre-release review cart floating around out there somewhere.

Keep your eyes open.