I had the same thought as Optom concerning what Heath would have done if things would have been the other way around. Would he have made a statement about Jake? I still do find it strange that Jake has said absolutely nothing and it appears that he will not. I actually did see Maggie speaking of Heath this past Friday on Entertainment Tonight. She was talking about what a great actor he was.
Well, there's a movie coming up where both Heath and Maggie are in so I'm not surprised she actually spoke about him. Heath is one of the leading actors of Batman so speaking about him it is probably mandatory and expected. In fact, I actually expect her to speak more about Heath in the months to come, when the movie promotion actually begins.
Also, Daniel Day Lewis, Naomi Watts and even Maggie had the ocassion to say something about Heath. They all did it duing interviews and awards ceremonies. When Jake's new movie Brothers is released he'll probably say something because as the lead actor he will have to give out interviews, and I am pretty sure journalists will not miss the opportunity to ask him about Heath.
I personally think it'd be an act of disrespect to Heath's family and even to Michelle if Jake had given out a public statement about Heath's death, considering how private Heath was. Jake is a smart man and I'm sure he knows what he's doing. The important people here are Heath and his family, not us. Jake had to show respect to them not to us. Just my 2 cents.