Will John Williams compose the score for Deathly Hallows 2?

I have been a devoted admirer of Oscar-winning film composer John Williams for many years, and like many others in the Harry Potter fandom, I have been hoping that he would return to the series to write the score for Harry Potter and the Deathly Hallows.  I read this brief bit of encouraging news on Wikipedia:

"Harry Potter producer David Heyman stated that, dependent on his schedule, Williams may return to compose score for the two-part finale of the series, Harry Potter and the Deathly...