1) All the dwarven settlements/mines in the Misties and Greys, as far as we know, were abandoned. However they will absolutely be represented.
2) Not that we know of. The White Mountains certainly weren't populated by Dwarves until Gimli settled Aglarond, and if there were any Dwarves in the Ash Mountains, they would have been allies of Sauron - though I doubt he'd be comfortable with them occupying one of his borders. I think it's more likely we'd see 'evil' Dwarves living in the Orocarni (off the map) or in the hills near the Sea of Rhûn.