Offensively:
I think Steve Clark is a good TE coach, and I hope to see some gouging TE plays with mismatched LB coverage.
If Allgeier is able to get 20+ carries, BYU wins. CCU has been a high scoring team this year, so winning the time of possession through methodical ground-and-pound will limit their explosive opportunities.
BYU runs a decent RB screen (often to Katoa), and if the Chanticleers send pressure often I think this could help open things up.

Defensively:
Continued creativity in terms of blitz packages, stunts, and varied man-zone coverage schemes. I've been impressed with the DB man coverage this year.