We saw pics of the mom and she was alllll Rottie. She looked to be pretty big too. We did not, however, get a pic of dad so we have to take it on the word of the family who had them.
Now, I have found one other set of pictures online of this same mix of breeds.
They are on Flickr here. If you go to the second page he has some pics of Kali when she was a puppy, and pics fo her litter to. They definitley look like our girls. Also gives me some idea how big they might get too.
As a side note, my Dad made a good joke when I told him about the pups. I told him the mix and he said "Well the mom would have to be the Rott. I don't think it would have worked the other way around."