For a variety of reasons, Miami will almost certainly exit the trade deadline with the roster they have now.
First of all, the Heat don't have many needs. This is a team that's won back-to-back titles, after all.
Perhaps Miami's only potential desire would be to add another wing player, given the uncertainty surrounding Dwyane Wade's health. But with Greg Oden and Chris Andersen now in the fold, the Heat don't need to chase a big man like they may have in the past. Nor does Miami need to go after a point guard with Norris Cole and Mario Chalmers both having solid years.
Another roadblock to a deal is the lack of tradable assets Miami has. Obviously, this team is full of talent, but the Heat aren't going to want to move their key players (The Big Three, Ray Allen, Mario Chalmers, etc.).
Furthermore, the players Miami would want to move (Udonis Haslem, Roger Mason Jr., Toney Douglas, etc.) aren't going to garner much interest around the league. And when it comes to picks, the Heat don't have much to offer—Miami traded away their 2015 first-round pick to the Cleveland Cavaliers in 2010, which means their 2014 and 2016 first-round picks aren't tradable under the Stepien rule.
A possible scenario for the Heat involves waiting until after the trade deadline and seeing if the Milwaukee Bucks buyout Caron Butler, who has been linked to Miami by numerous sources (including B/R's Ethan Skolnick) in recent weeks.
The Heat should have no problem cutting Douglas or Mason Jr. in order to make room for Butler.
Butler isn't having a great year (he's averaging 10.5 points on 38.2 percent shooting from the field and 34.6 percent shooting from three), but the fact that he's in an awful situation in Milwaukee could be contributing to his woes. Last season, with the contending Los Angeles Clippers, he averaged 10.4 points on 42.4 percent shooting overall and 38.8 percent shooting from beyond the arc.
Butler is inexpensive and he would give the Heat more depth on the wing.
Given the scarcity of trade options for the Heat, playing the waiting game with buyouts is their best bet.