Like you I don't expect him to change much.
Came across this just now from Stillman....
https://arseblog.com/2018/08/laca-balance-auba-under/
In fact, most of Arsenal’s squad is unbalanced, but the forward line has a lot of individual quality and players in their prime which ought to reduce the impact. I still think that this squad is most suited to a back 3 given the lack of dominant centre halves and natural wide players. Arsenal have a top class number 8, a world class number 10 and two good strikers, all of whom could be well accommodated in a 3412 system.
He mentioned something in the link article that I hadn't thought much about which is the interchange of the full backs with the forwards in wide positions. Bellerin could be left without an option but this is where the front 3 can be fluid in their movement and combination play with a solid base behind.
Anyway I'd play....
-------------Cech-------------
------Mav--Mus---Sok--------
Bell---Ramsey---Tor---Monreal
-------------Ozil----------------
--------Laca----Auba----------
But I think he will play...
Cech
Bellerin
Mustafi
Sokratis
Litch/Mon
Torreira
Guenouzi
Ramsey (if fit)
Ozil
Auba
Laca