The original reason these two teams are always mentioned, is because they are big market teams. NJ/Brooklyn has Deron Williams in place, and Howard has expressed interest in playing with D-Will over the summer. He also said he'd play in Chicago because of D-Rose. LA was mentioned for obvious reasons, in terms of their market.
But I think Brooklyn will have enough cap room to sign him this summer, AND sign Williams. Orlando is faced with the possibility of losing him for nothing at the end of the season. So if Dwight is planning on signing with Brooklyn either way, they might as well try to weasel something back from them in return (i.e. Lopez or Brooks or something).