I don't really understand this. Regarding slides, obviously aftermarket folks will start making drop-in Gen V compatible stuff. People have just started getting their hands on the Gen V models this week, give it a little bit of time. Most people don't customize their slides outside of red dot cuts anyways, and Gen V slides can be cut the same way - see this IG post from Nameless.
For the other stuff, the middle of the slide to the front is the same, if you want ports/slide cuts/ whatever.
The frames are also almost the same. If there's any changes that need to happen with trigger kits, I'm sure those will be solved pretty quickly. Apex is currently undergoing testing: "
Glock Gen V - We are investigating the use of our kits in the Gen V models. We
do not recommend our kit be installed or used in the V models until we finish our evaluation, drop test, and test fire."
https://www.apextactical.com/apex-gen-5-glock-action-enhancement-kit-1-8009 and I'm sure the other folks are also working quickly to verify compatibility.