We had a lot of "ground" the past two seasons, but not much "pound." There has certainly been a concerted effort to bring in "pound" players, but as I have said other places, the real key to all this will be improvement in the offensive line play.
As for stretching the field and all, I doubt you'll see much of that. Even though we may have one of the better WR cores in the NFL, these four factor speak against much production for them:
Lack of a top tier—maybe even less than average—QB to get them the ball. A head and offensive coach not pre-disposed to a "throwing down the field" philosophy. Purposely building a team in the off-season to "Ground and Pound." A great defense that will win you games (this equals => conservative O play calling).
So, to answer your question: "What to expect?" = Nothing exciting. As little as necessary. A lot of running the ball, short dink and dunk passing, and an occasional bomb to try and get one over on the Defense. But in short, pretty much what we've seen the past few years.
I would love to have seen what Chan could do with these offensive toys, he would have had some real fun with them.