I don't think that has been mentioned in any of the news releases. Maybe SFX magazine will have some info at some point. Kor
Its possibly an Arri 3.2k(4K) because that's what we saw in the Production Begins trailer. It easily upscales to 4K. http://www.arri.com/news/news/alexa-sup-110-with-prores-32k-released/
Eh, uprezzing will never actually give you more detail, so it's best to shoot higher than 4k and downrez to whatever you need. 4K cameras are widely available, and with Discovery's budget, shooting on 3.2k is short sighted.
Well, yeah, but resolution doesn't tell the full story Shooting at 6K or 8K doesn't automatically mean you're getting a better image than you might on a great 3.2K camera. It doesn't help that going beyond 4K is largely diminishing returns anyway.