I'd LOVE to be proven wrong, but if we have to be honest here despise my previous attempt to "figure out a compromise to make "pop-ups acceptable for Larian" I'm almost ready to bet that their "rework of the reaction system" will end up being as some of their past "reworks": hardly a meaningful change, or at best a crutch rather than an actual solution.
I'm almost confident they'll add a few more *fully automated* reactions and that's pretty much it.
"Counter-spell", for instance, will either be automated as well (which is risky, given that wasting a spell slot in automatic is far more of an issue than wasting an AoO) or morel ikely it just won't be a thing at all. Dismissed as "something that doesn't work well in a computer game" or something.
