Flacco is the new OC, not Caldwell
Of course Caldwell is going to call some plays here and there, adjust the offense to game plans, and manage the players. But by and large, this is now Flacco's offense to run. I won't be surprised if we go no huddle completely now with Flacco, apart from in obvious situations like goal line plays or when we have to run the clock.
I just hope the route trees are much quicker timed, and Caldwell wants to implant slants into that dusty old play book of Cam so that Flacco can use them in the no huddle.