Browner is a former Seahawk that will come on a very cheap deal (terms to be announced). He's suspended for the first four games of the season for violating the league's performance enhancing drug policy. He also will go four games without pay.
Browner will be 30 years old to start the season, stands at 6'4, 225 lbs, and in a quality special teams player (someone please post the .GIF in the comments).
The Patriots could use Browner as both depth at corner and possibly as a specific defender for tight ends. He thrives in press coverage and should do well once activated.
There are contrasting reports, as Tom Pelissero of USA Today reports that there is no deal, while Jason La Canfora of CBS Sports is reporting that Browner is in Washington. However, Rapoport is linked into the Boston beat from his days at the Boston Herald, so I'm inclined to believe him.
Edit: Apparently an agreement has been reached, but nothing has been signing. Could have a late interception by another team before the paint dries.
Edit2: The general understanding is that Browner wants to join the Patriots and has agreed and told his close group of friends, while his agent is trying to get a few more dollars added on top of the deal.
Edit3: So Rap Sheet is right. Josina Anderson of ESPN is reporting that Browner is in the Boston-area, not DC. Deal likely to become official soon.