I know I can't replace the bearings w/out replacing the entire hub assembly, but is it possible to re-pack them?

No, its a sealed assembly. Not that you'd even want to repack them, because the bearing race can be scored or damaged. Reducing the performance of your brakes, hub, and bearing.

y not just buy a new one they arent that bad..

just trying to get off cheap. It's not that there is any problem, I just thought at 100k it'd be a good idea. Oh well.

If it ain't broke, don't fix it. They may go 200K.

I am certain that I read on Edmunds that they recommend repacking the bearings. I had to replace a bearing on a Reatta that was also "sealed' for life and I could have easily repacked them. If only I knew before hand. I suspect that the Cadi bearings are the same. I also like to overmaintain my cars. I can't find the reference in Edmonds now.

They are sealed, don't do anything to them unless they go bad.

The days of repacking or replacing a $20 wheel bearing are long gone.

I've used the hubs from front wheel drive cars for trailer axles. Mount a rear hub on an axle flange and good to go. No problem submerging in water (sealed) no need to ever repack! My experience when one fails, its caused from a side impact which can distort the race and cause bearing failure.