and here I thought it was a reasonable question....
funny too, that none of the bands no when they are playing, or what stage... not even the headliners. (this, according to the line up page on coachella.com)
I guess I'll try the psychic network next.
you can find a shitload of threads asking the same question. most people seem to think it will happen midweek this week, either tuesday or wednesday. although, some people think it will be as early as monday and some think it will be as late as thursday.
if i had to make a guess, i'd say wednesday, two days before the first day of the festival.
It will be just random, every band will have to play a giant bingo where all set times will be decided at the moment, so with some bad luck Rage will be opening the Gobi tent sunday evening and Comedians of Comedy will headline friday at the mainstage.