It was filmed in IMAX, wich is the double of the 35 mm film, used for most of the Hollywood movies. They can use something with the double resolution of a Bluray and still don't lose quality.
I think some TV Stations in Japan are already broadcasting in 8K.
It wasnt resized but a complete 4k "master"
The colors are the same as the Live in Montreal release.
The only thing I noticed is that sometimes I had the feeling the video was running above 24FPS but I dont know if it was just my imagination or if they did something to emulate more FPS...