Ah, yes that does look more busy, although seems to be clumps of people, not millions by any stretch. The 'fencing' looks like Black flags sword play, hated that. I preferred climbing back on the ship's railing running around for instant assasinations, or simply sink the other ships to avoid the annoying combat altogether. I rather play a sequel to Dishonered.

Oh look at that http://masterherald.com/dishonored-2-likely-to-release-on-the-next-gen-consoles-by-2016/2526/ :)

No one can have an 8k set up today with today market's GPUs that I know of, I dont even know if there are any screen on the market that support 8k resoultion at the moment.

And of course you can play 'decade old' PC games in 4k, but thats not really that impressive, is it.

Quad-Radeons scale well at high resolutions, you might just be surprised.

And you don't need an 8k screen to get an 8k resolution display setup anyway today.

And lastly, the PC is a platform that is constantly evolving, if you can't run a game at the full 8k? Then run it at quarter of the resolution and scale it up, PC gamers do the reverse and scale down higher resolutions to a lower one all the time (Most of the time, they probably don't even realise they're doing it.), you still get a better picture than 4k and you can wait whilst the PC hardware evolves and catches up.
Majority of older games and less demanding games will run fine at 8k with quad Radeons, it's only 4x the resolution of 4k.

http://www.kitguru.net/components/graphic-cards/anton-shilov/amd-and-nvidia-already-preparing-for-8k-76804320-uhd-displays/
http://wccftech.com/crysis-3-screenshots-8k-resolution-show-beautiful-ingame-landscapes-smooth-grass/

http://www.youtube.com/watch?v=7Ql0m4nbnT8 new updated gameplay of the ps4 version. looks good to me