Chess seems to be divided into two camps. There are the folks eager to make the game yet more complicated with new variants and then there are those who think chess should be left alone. Gotta admit I don't see the attraction of new pieces and rules, but maybe you have to be young and still want to change the world. 
Evil chess suggestion
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Dec 24, 2015
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#3
If a pawn promotes on the a or h file, it assumes god-like powers and can travel through time and space at will. If it promotes on b, c, f, or g, it becomes a queen that has the ability to move like a knight. If it promotes on d or e, it must sacrifice it's firstborn to the evil god Moloch before it can move. Knights must make a complete knight tour of the board before they can resume normal play. Kings can only move one square, but on Tuesdays and Thursdays they can move two squares--but only forward.
For cripe's sake, isn't this game complicated enough without trying to muck around with it and make it totally impossible to learn?
All those new pieces the OP suggests are worse than promoting to a queen.
I suggest few new chess pieces. This pieces can be given only if pawn walk to last row.
Sniper. Moves like King, but capture like Queen.
Cavalry. Move like Rook, but capture like Knight.
Marine. Moves like Rook, but capture by neightbor diagonal.
Rogue. Moves like Bishop, but capture by neightbor orthogonal.
Also I think forbid choose standart pieces as pawn replacement.
How you think?
Also I suggest choose one piece on start.