Now changing tack midway through a TV series often is death but "Friday Night Lights" pulls this off. After Season 3 we had an inkling of what was to come but a whole new cast of characters was added as Coach Taylor takes over the very rundown and neglected East Dillon (located in the poor part of town) football program. Some older characters (Matt and Lyla) do flit in and out but Riggins is still front and center even though he has graduated from high school and Landry (or Lance as Coach Taylor still calls him at times) still adds comic relief.
The real revelation of the new cast is Michael B. Jordan (yes, that's his real name) who plays Vince the new quarterback of East Dillon. Much of his back story is heartbreaking, but he is the fulcrum around which the entire season revolves around.
Of the four seasons so far this is arguably the best just because the established characters and the new ones mesh so well. An amazing piece of both scriptwriting and filmmaking.
The extras are same as usual (commentary tracks, deleted scenes and a new decent behind-the-scenes look).