I’m wondering what the UHD LOTR will be sourced from. While it was shot on 35mm,it was finished digitally as a 2K DI,so going back to film would mean redoing the entire post production and believe me, it would not be as simple as rerendering CGI in 4K - even if they still had all the assets and project files, which is ridiculously unlikely, CGI is rendered in layers, so the compositing would have to be redone as well - basically it would take pretty much the full cost of doing post production on a very high budget movie,so more than likely, they will go to the original 2K DIs, upscale them and give them an HDR grade.