Well Prometaltech did a bumper case for iPhone 6/6s. When I pressed Harold Lee about when this would come out since mid 2015 - he went silent after saying they had delayed a third time. Their bumper case is their video on their web page.
"2015. 07 Supply agreement with IG / MAPtech for iPhone6/6S bumper case"
If considered an Apple accessory it would have to be approved by Apple under their authorized third party accessory provider guidelines.