11:25pm: The Mavs confirmed this deal via press release, as it was reported: Cunningham, the 16th pick (Nogueira), and the 44th pick (Mike Muscala) in exchange for the 18th pick (Shane Larkin).
9:05pm: This deal is "still evolving," according to Broussard (via Twitter), so we'll have to wait and see if any of the previously reported details change, or if any new pieces are added.
8:46pm: Pick No. 44 is actually heading from Dallas to Atlanta in the deal, tweets ESPN.com's Chris Broussard.
8:13pm: Minutes after acquiring the No. 16 pick from the Celtics, the Mavericks will flip it to the Hawks, according to Adrian Wojnarowski of Yahoo! Sports (via Twitter). Jared Cunningham will also go to Atlanta in the deal, with the 18th and 44th picks headed to Dallas, Wojnarowski reports (via Twitter). Atlanta doesn't have the 44th pick, so perhaps Woj means No. 47 or 50.
The move clears a little more money from the Mavericks' books, as Cunningham's $1,208,400 salary will be assumed by the Hawks. That'll give Dallas a little more room to squeeze in a maximum-salary offer for Dwight Howard.
The Hawks will use the 16th pick to draft international big man Lucas Nogueira.