I know they've been talking about this for at least the last 5 years. Not sure.
EDIT: I did some checking because this peaked my interest. Apparently in the 40's, they decided against using thorium in reactors because of the weapons grade uranium they needed. You have to bombard thorium to make is fissle, and it becomes U-233. U-233 is a highly efficient energy producer, but the weapons grade is a high gamma ray emitter. One bomb would give off radiation particles with a half life of 150000 years. On the other hand U-235 (what we use today in reactors) produces weapons grade uranium, and when a bomb is detonated, the particles have a half life of 27 days.
So, they're using uranium so they could make bombs that don't sterilize the planet. India is currently bringing a thorium reactor on line, and wishes to become the next "middle east" of thorium energy. The US, Brazil, and Australia also have massive stores, so a conversion could be on the way if India gets the tech down.