Bigun said:
I'll ask again: will opening the case to change the buttons void any warranties?
No. It's been made clear from the begining that opening the case does not void anything. If you want to switch the buttons around or solder in some LEDs or whatever else you can think of, the warranty against manufacturing defects still applies. It doesn't matter if you cut a huge hole in the side to mod in an extra USB port - if something fails that is unrelated to your mod, then it's covered.
However, if you break something while opening the case, that's all on you. If you strip out the screw holes or dribble globs of solder across the board or mod in something that burns out the power circuitry, then don't expect a replacement.