My honest-to-goodness theory/hope is that they're either doing option A) a Superman/Superman Family show that will focus on our three leads, Superman, Lois, and Jon, or option B) a Superboy show in the mold of Smallville, but with Lois and Clark as the "Ma and Pa."
I mean, the Earths (1 and 38) are 1000000% going to merge together by the end of Crisis. That's just a given. So that leaves them even more wiggle room than Reborn had when they integrated Jon and the Superman family in. With how the whole CW show continuity plays with reality, this would be right in line.
Option B seems slightly more likely to me right now mainly because even though WB seems super cool with having Superman and Batman on TV in full glory, they seem skittish when it comes to doing a whole show about them, and just them, that'll run for a good long while. Like, we can fully expect Bruce to not just show up but suit up in Batwoman similar to Clark and Supergirl, but I don't see a Batman show.
So, to me, right now, some sort of Superboy show that fully takes advantage of the pre-teen to teen market (they currently have no show that headlines with a teen atm) seems viable ESPECIALLY in a post-Stranger Things/IT Remake world. You still get your backdoor Lois and Clark show on full blast, but WB also gets to continue being skittish by making it so it's not them headlining. Also gives them the opportunity to adapt the much loved Tomasi, Gleason, and Jurgens run. Might even get Damian out of the whole deal.