Anything updated in Arch will be updated in EOS at the same time once it is out.
You should always update with pacman/yay and packages will be updated from repos/AUR respectively.
There’s a rather big Nvidia issue that is coming down the line regarding it 470 drivers that will require some choices and intervention on your part of this falls in your lap.
I don’t know much more about it really though because I won’t ever buy anything with Nvidia.
See if this applies to you here: Nvidia drops 700 (Kepler) into legacy branch (470xx) - #8 by Locutus