I'm not sure why zone has become such a dirty word on this board. I think everyone mistakes a zone defense for a passive defense, but it doesn't have to be. Even Revis at the beginning of last season said in an interview that he likes to stay aggressive, whether he's in man OR zone. I think the passive zone people are assuming comes about when you:
A) don't have confidence in your DB's to make smart, decisive decisions, so you back them off more to give them more buffer (at the cost of some soft plays).
and B) don't have confidence in your pass rush, so you need the DB's to keep the play in front of them for more time.
Now, both things may still end up being true with this team. There are question marks in the secondary for sure, and while the front seven has had some talent added to it, we've yet to see how it will all come together. But I think people need to separate the zone coverages of Patriots teams from 2010-2013 with what a proper zone defense can be with the right talent.