Hull, 26, was initially drafted by St. Louis in 2010, where he spent three years with the team before moving to Washington last year. Hull is a proficient special teams player and depth linebacker, and will likely be asked (should he make final cuts) to fill the role left by Dane Fletcher after his departure for Tampa Bay earlier this year. If he does end up making the team, Hull isn't likely to see much on-field action; he has only registered 25 career tackles. But as an additional camp body and extra linebacker to help fill a thin position, this isn't a bad move at all.
Look for New England to start making similar moves over the coming weeks and months leading up to training camp; they have the roster space for it.