http://www.guru3d.com/articles-pages/asus-radeon-rx-470-strix-gaming-4gb-review,1.html
Seems guru3d is more or less confirming the rx 490 card:
"Vega 10 - AMD Radeon RX 490 8GB (enthusiast class performance)
Polaris 10 - AMD Radeon RX 480 4GB and 8GB (high-end performance)
Polaris 10 - AMD Radeon RX 470 4GB and 8GB (mainstream performance)
Polaris 11 - AMD Radeon RX 460 2GB/4GB (entry level)"
Seems guru3d is more or less confirming the rx 490 card:
"Vega 10 - AMD Radeon RX 490 8GB (enthusiast class performance)
Polaris 10 - AMD Radeon RX 480 4GB and 8GB (high-end performance)
Polaris 10 - AMD Radeon RX 470 4GB and 8GB (mainstream performance)
Polaris 11 - AMD Radeon RX 460 2GB/4GB (entry level)"