Like for like but hopefully extending depth. Arteta's circle of trust last season was really only 11-12 field players, after that he just didn't want to rotate unless absolutely necessary. We need to bump that number up to 15-16 to realistically compete with City.
Havertz comes in for Xhaka.
Rice is basically a new addition.
Timber is essentially going to replace both Tierney and Holding (neither of whom were in the circle of trust).
If Partey leaves, we seem likely to sign a replacement like Lavia.
So if all that happens we'll have something like Saka, Jesus, Martinelli, Havertz, Odegaard, Rice, Zinchenko, Gabriel, Saliba, White, Ramsdale as possible starters with Trossard, Jorginho, Partey/Lavia, and Timber as trusted rotation players and hopefully a couple of ESR, Vieira, Kiwior, Tomiyasu, Nketiah/Balogun (one will stay and one will go I think), or Nelson earn their way into the circle of trust.