The trend of correlating device number (i.e. Nexus 'X') with screen size is going in the wrong direction. 6 is already too big (and heavy) for some. Next year, there'll be no distinction between phones & tablets.

Edit: Disappointed with the pricing too: $649. Google had set a good trend with Nexus series - Awesome devices at exception price. All that's gone. Kind of against the Android One initiative.