In case you're going to the game but you've been under a rock this week... From UA Athletics:

Bryant-Denny Stadium to Open at 11:30 a.m. on Saturday; Fans Encouraged to Arrive Early Due to Heightened Security

Saturday’s screening process at Bryant-Denny Stadium will differ in some ways due to the heightened security, thereforeticketholders are highly encouraged to be in line for entry no later than 1 p.m.

To help accommodate, gates will open at 11:30 a.m., three hours prior to kickoff.

Fans should be prepared to remove all items from pockets and any pinned-on buttons or larger jewelry, similar to when passing through airport security, before entering.

Be advised that some items typically permitted in Bryant-Denny Stadium, such as empty cups, will not be allowed in this weekend
Follow the link below for a full list of prohibited items.

A clear bag policy is also in effect. Permitted bags must be clear plastic, vinyl or PVC and do not exceed 12" x 6" x 12". One gallon clear plastic bags and small "clutch" purses, no larger than 4 1/2" x 6 1/2", can be taken into the stadium in addition to the approved clear plastic bags.