My understanding is that the AFC and NFC alternate nominal home and away team status in the Super Bowl. In the theoretical case where a team makes it to the Super Bowl in the same year that their stadium hosts the Super Bowl, does that in any way alter home and away team calculus? Would that "home" team perhaps still be required to use the visitor locker room in their own stadium? Would they still use their away uniforms?
It hasn't happened yet for any NFL team to play the Super Bowl at their home field (though two teams played in the game when it was held in their cities/areas).
If it happens, all the arrangements will remain unchanged. Both teams will be treated as "away" teams when it comes to their uniforms.
The "home" team would probably feel more comfortable than their rivals using locker room at their stadium (though they could draw the visitors locker room), and being close to their training facilities.
Would such a game give the "host" team an advantage? Well, probably only mentally, because all the other aspects would remain just the same as they would be if they'd be playing the game anywhere else.
The ticket would be split evenly, so this wouldn't make much difference, though the local fans could try some ways of getting more places for themselves.