per the demo play rerolling one die for having armor far superior to the attacking weapon is effectively so small as to be no benefit.
nothing else regarding the effects of armor has been publicly shown afaik.
rerolling one die when you wearing an armor jacket, helmet etc against a pistol is weak sauce indeed.
some would say it's functionally irrelevant.
And that's a much more fair assessment than some of the dark places this thread has gone

I've got my concerns about armor as well. But I'm largely ok with armor not actually performing like in 5e.

In 5e, for game balance purposes, you're just not allowed to aim for the unarmored portions of the body. The way I see it in 6e, if the guy's wearing a bullet proof vest it's already assumed you're just aiming for the face. or whatever

The better the armor, the more careful you have to be about where you shoot, and in turn that gives advantage to the target. One rationale of many that needn't necessarily be explicitly spelled out to emerge from the veil of abstraction.
My concerns about armor?
1) Since you can only gain edge so often, armor quickly DOES get marginalized if you're getting ganged up on.
2) Soak pools seem decently balanced against DVs in the CRB. But SR6 will have a corpus of more than just the CRB before very long at all. They'll have to do a much better job of resisting the urge to give in to power creep than they did in 5e expansion books.
I do have my hopes about each of these. 1: If you're getting outnumbered 2 or 3 to one, you SHOULD be in a world of trouble... so I'm provisionally ok with this still. And besides, even though you can only GAIN edge so often, you can DENY edge indefinitely! and 2: we'll just have to see.