Your bearings will get repacked by default while replacing rotors. There's a writeup in the Download section that'll tell you all you need to know.
I don't think that you'll have to disconnect the calipers from the brake line to replace the rotors. But if you decide to, that would be opportune time to replace the brake lines with Stainless Steel.
Lemme know if you strip out the heads on those little screws on the hub nut retainer. I've got some allen head replacements I'd be happy to send your way.
Tom
Edit:
Actually the article is in the How2 section but it's not in the right place (not under brakes ... it's under drivetrain).
http://www.vehicross.info/modules.ph...warticle&id=59