How much involvement do the new coaches have in practice and bowl prep?

Just curious how a new coaching staff works their way in. Once practice starts back up, are they taking over and implementing their methods or do they let the existing staff continue what they have been doing and just observe? We already know Wilson will be coaching the bowl game, so what involvement does Kiffin have?
Any chance we see some new looks from the offense in the bowl game?
I'm sure the new coaching staff is spending a lot of time watching game film and observing talent to figure out what holes need to be filled.