At least according to everyone's (least) favorite NBA reporter and analyst Chris Broussard.
While there's always the possibility that his "anonymous sources" are friends of his who are idly speculating about free agency, they did have some interesting things to say about the Deron Williams sweepstakes:
Many believe the Brooklyn Nets, Williams' current team, have the advantage because they can give him a five-year, $108 million contract, while other suitors can offer only a four-year, $81 million deal. But Williams is a smart guy who has not wasted the significant amount of money he has already made. He knows that the difference between $81 million and $108 million will not alter his lifestyle, so don't expect Williams to sign with Brooklyn simply for the dollars.
Broussard notes that Williams and his family love living in the NYC area and he has close connections to people in the Nets organization, but he also reports that Dallas is still Williams' favorite city and the All-NBA PG thinks a pairing of him and Dirk Nowitzki could be a title contender.
As always, no one really knows anything until free agency begins, but for now it's fun to speculate, at least as long as speculation isn't completely ruling out the Mavericks.