I would say you do your research and then try to focus on GRE. If you feel school, you intend to attend, is accepting GRE then go ahead with it.
There are many schools that accept GRE, but they have not disclosed it. Yesterday I attended an MBA event and representative from MIT said that MIT is accepting GRE from last 10 years. As discussed in yesterday's event, schools have started accepting GRE just to bring diversification in class. As per most of the schools many probable candidates do not apply to business schools because these candidates do not want to go thru GMAT procedure. Since most of the students take GRE during their college time so in a way it reflects the true potential.
Only Standford( i guess) has the data for GRE while rest all the schools are still analysis process.
Kellogg will start accepting GRE score next year onwards while booth still needs sometime to think. Only schools that accept at this moment are Wharton, HBS, MIT and stanford.