The site's product page for the BD/DVD says "Out of Stock", so it would leave to assume that Viz is to blame for the shipment delay. That or the Veteran's Day holiday delay...or that the manga is also coming out today. Either way, it's very odd that Viz wouldn't release it on time.
UPDATE: Best Buy and some other stores have gotten copies. So, this raises concerns on the delivery part.
I’m guessing that they’ll follow the same pattern they’ve kind of kept up with. They’ll probably do Stars part 1 in late spring/early Summer. Then we’ll get Stars part 2 in November. The Super S Movie could come at any time really.. it could be first quarter 2019 or they could hold off and use it in early fall before Stars Part 2. All this is just my guess.
There’s also the possibility that they could do rereleases of the previous seasons with the new Toei HD upscale (since they’ve been using it for SuperS, I’m assuming they also nabbed it for the other seasons.) Though id bet that they’re gonna hold off on that until all of the current releases are out. If they put it out at all..