According to a report from Adrian Wojnarowski at ESPN, Kyrie Irving wants to be traded to the San Antonio Spurs.

Earlier Friday, reports emerged that Irving met with the Cleveland Cavaliers last week and asked to be traded.

While members of the organization are said to be surprised by the request, particularly LeBron James, the last part of the story to break is that one of the few places that he wants to be traded is to the Spurs.
http://www.kens5.com/sports/nba/spur...purs/458605876

Knicks, Heat, and Timberwolves were also listed as preferred destinations.