About 4K (just that.)

I can't guess if you had the discussion about "the studios" and how they pushed back on Blu-Ray titles for fear of leaking HD content.

4K looks to be yet another round of debate where the studios hold back 4K content until they figure out a lot of issues.

-> There's a reason to not show same content on 1080p displays next to 4K content. That would make it easy to compare and a good retailer would want to maximize or amplify the 4K sales. Think about it.
Bob