Google Fiber has developed Super-PON, designed to go 50 kilometers. That's more than twice the reach of today's GPON. The illustration at left is a mid-sized city served by three central offices. Below, the same city using today's PON. It requires 16 COs.
Working units are in the field, probably from Adtran. That's not official, but I doubt DeSanti would have keynoted an Adtran event if an Adtran product wasn't close.
DeSanti made the surprising comment, "Aerial is prohibitively expensive due to policy restrictions of pole sharing with utility companies." The common wisdom is that aerial is much cheaper than underground.