The only unfortunate part about the sing-along Blu-ray is that it still uses the old transfer, not the new 4K version. And you can’t watch it without the lyrics.
It's a bit of a shame that they didn't do the theatrical poster for the cover but it's better than the Blu-ray cover. Also it's weird that Paramount made this a combo pack. I thought they didn't do that anymore.
They wanted to put an alternate version on the blu-ray (most of the times, the 4K Steelbook usually has a blu-ray but for this) which is the Sing-a-Long version in which was re-released in theaters a couple days before it hit 4K (I saw the Sing-a-Long in theaters, it was interesting how they did it) so fans would love to rewatch it in great quality. Hope that answers your question. Its usually either an alternate cut or bonus features on a blu-ray with the 4K nowadays.
If you hate South Park then this show is bot for. Have you not hear their offensive lines the warning at the start bro? That's a total shame that you have no wisdom