I would bet on they’re also doing individual packages for each title. Collectors’ edition packaging (steelbooks, retailer exclusives) seems to be where it’s at right now in physical media.
Since TLJ and Solo are already out there in 4k, it might actually make more sense to only release the other eight movies individually for now. They could even make that the way you get the unaltered versions, say it’s a limited edition just like the GOUT. Then later on they could do a streamlined box set that’s just the final versions of I-IX, no OOT, no Rogue One or Solo.
Except that the SE isn’t the final version of the films but the rough cut that accidentally got released by a zombie creature that kidnapped and ate George Lucas. 😉.