It's definitely possible, but the Epic devs will make their final changes to whatever we put up, wether they reduce texture resolution, increase it, change proportions whatnot. I plan on making every one of my pieces of art maintain 1-1 pixel detail and quality up to 4k. Wether Epic chooses to ship the art with that fidelity is up to them. I plan on making the argument to have everything hold up to this fidelity: if you guys want to voice your opinion to encourage this: sign up to the Epic Games forums. You'll have one contributor behind you: it's one advantage to having a hardware enthusiast as an artist.
Will have to sign up to a new account and start posting. Pretty sure my last forum account got banned by Flak during the great UT3 beta protests