We've been mapping out the deployment in the forums. There are pockets of fiber around the Twin Cities and sightings of crews running fiber in even more places.
essentially, its in exactly the area I figured, and its all newer homes, with higher incomes, and nicer neighborhoods. Its AT&T and Centurylink essentially cherrypicking what areas they want to drop this into knowing who will pay for it and make their uptake rates worth it. It likely won't expand much farther outside these small zones because the median income drops quite a bit within 1/2 a mile.
Centurylink will no doubt expand it eventually. They don't really have a choice. They have been able to push FTTN for all this time but VDSL will not be able to compete with docsis 3.1.