If the defense is solid, then I think it's an indication (although not an ironclad one since we are at home) that the D will be good again this year.
Offensively, I'm looking for coherent play calling, clock/game management from Mularkey, and ability to run the ball. While a good passing game wouldn't be a "season indicator" for me since the Jags have not been strong on the pass rush, if we can run the ball it augurs well (been waiting to say "augurs") for our new approach on offense.
Oh, and well-timed and SUCCESSFUL gadget plays wouldn't hurt, either.