The next The Voice season airing in Spring of 2013 will have new judges. Shakira and Usher will replace Christina Aguilera and CeeLo Green as The Voice judges. NBC said that Aquilera and CeeLo take a break. This could mean they come back. Aguiera is busy promoting her new album and CeeLo Green is supposed to work on the music for a sitcom based on his live. Via US Weekly.
The Voice Season 3 just started. I am not sure why NBC has already announced the judge change for Season 4 so early.