The Passives would be good to stay the same,
Swords, Axes, Maces, Daggers are all good. The funny thing is just how much you could work with the post apocalyptic side of things.
To make things really cool, diverse and unique to this game, why not try and make weapons break down less or moreso depending on your skill with them.
I dont know about other games, but in dins swords and axes weighed supreme. It would be interesting to see that clubs might be better off and break down less in this game.
On top of that, the rogue skills will be useful to see how much they come in handy.
Shadow, how will you handle the survival of things in the skill-side of things?