There's no guarantee of that. And really other than being short, you can't really call a dwarf delicate.
I agree that the "anyone who won't break" thing is silly if it's meant to refer to dwarves. They are specifically known for being the sturdiest and hardiest of the races outside of qunari. To me, that sounds more like elves than dwarves.
However, Alan has hinted that there might be animation concerns, which has led people to think that dwarves (being the shortest) would be the hardest to animate with a qunari, so they would be out as well.
I'm still waiting for confirmation, but I'm assuming the worst just to keep my optimism in check for now.