Based on the AMD press slide released this week that covers the naming, yes:
This implies the RX 485 will be revision 2, and this to me suggests it will be equipped with GDDR5X and a double 6 pin power connector. The give away is the memory interface being 256bit with any memory interface greater than 256bit being reserved for RX 490 and up. Because of Polaris 10's IMC we also already know the existing Polaris 10 IMC is GDDR5X compatible.
The other implication with this slide because of tier 9, is that the RX 490 is practically guaranteed to be a cutdown Vega 10 GPU with HBM2. It'll be interesting to see what happens with the GTX 1060 and RX 485 pricing as supply catches up with demand, same thing with the GTX 1070 vs RX 490. I expect something to be announced by the end of August if not sooner. AMD can only afford to let the GTX 1060 and 1070 to go unchallenged for as long as 1070 and 1060 can't stay in stock.