I've been a big fan of Breaux since he first considered entering the league a few years ago. The fact is that you can't have too many good CB's these days and CB's with size are rarer still.
As for a potential future with the Pats, that is yet to be seen. If he were here back in March, like it was previously posted, then we know that, at least at some point, there was an interest in him. It could be that he's not healthy enough yet to bring in for a workout. It could be it was determined that he is done, or at least done for the near future.
What we DO know is that we currently have a very deep and experienced CB pool setting up for this TC. Between the additions of McCourty and the draft picks, plus CJones and JJ coming back from injuries and the returnees, we should be as well set up at the CB position as we have been in a LONG time, regardless of who the 6 guys who end up making the team turn out to be.
Just guys who are coming back from injuries ensure that this defense will be far different than the one we had for most of last season. Don't be surprised to see it start off much faster than last season.