The picture was taken in an AMD testing lab and besides the Radeon Vega Frontier Edition there's also a glimpse of a second card in the lower right corner of the picture. That card looks like the Radeon RX Vega that was shown at the AMD Capsaicin & Cream event in February.
Testing Frontier's lighting system, photo by @EvanGroenke @RadeonPro @AMD @GFXChipTweeter pic.twitter.com/wngzfcGAxr
— Chris Hook (@GChip) May 18, 2017