Not that I'm aware of. He took part in the Bruins annual toy shopping event a little over a week ago, so I would presume he wasn't at Savard-level incapacity at that point in time. But no news isn't particularly good news; I imagine if he were skating, or even doing off-ice workouts, the Bruins would publish it...and AFAIK, they haven't said a word.
Given his concussion history, and the growing concern over concussions, they may be going really slow with JML. Or, given his concussion history, it could be that his chance of returning this season - or ever - are nil.