In terms of the running game, OC Jay Gruden hinted that it could end up being a 50-50 split [between BenJarvus Green-Ellis and Giovani Bernard]. Green-Ellis had nearly three quarters of the carries last season, but the plan when they signed him last year was to use more of a backfield by committee.
The other thing that makes Bernard dangerous is his ability to catch the ball out of the backfield. The Bengals were the only team in the league last season not to have a running back with a reception over 20 yards.
We knew Bernard was going to be heavily involved in the passing game, but a 50/50 split in carries provides some clarity about how the touches will be distributed in the running game. There's no quote of Gruden saying as much, but the reporter inferred that Gruden was hinting at a split.