The whole point about the main dwarf society is that you don't get to see it much because it is underground and located in a few specific places because the rest of the Deep Roads is overrun with darkspawn. DA2 was located in the Freemarches where there is no current underground dwarven settlement, which is why the only specific dwarven connection underground is the ancient thaig. All of our dealings with Corypheus and his followers are on the surface and again nowhere near the northern part of Ferelden where the entrance to Orzammar is. Have you played the Descent because the dwarves become a whole lot more significant there.
Surface dwarves don't seem so distinctive because they have adapted to society on the surface in order to survive. So they just crop up randomly on your journeys without having a distinctive culture of their own.
If DA4 is set in Tevinter and northern Thedas then there is going to be scope for getting some interaction with dwarven culture again. There is the Ambassadoria in Minrathous, dwarven embassies (all underground) in the major cities and Kal Sharok over on the edge of the Hunterhorn Mountains on the border with Orlais. I hope we are going to be able to visit Kal Sharok because there have been strong hints that they are not like other dwarves, having had to go to extreme lengths to survive after being abandoned by Orzammar.