During a press conference in Australia AMD has released specifications of the Radeon RX 470 and RX 460. The RX 470 is positioned as "HD gaming video card" and is using the same blower style cooler as the RX 480. AMD confirms that the RX 470 has 32 Compute Units (CUs), which is 2,048 shaders.

AMD partners will have the ability to fab 8 GB cards. The AMD reference card however will have 4 GB of GDDR5. Like the RX 480, the RX 470 will include a 256-bit memory bus. We also see a 6-pin PEG connector on the reference card. According to the latest rumors, the card will have a TDP of 110 watts.

This older slide above actually denoted Polaris 11 with 16 CUs, this now is listed and changed to 14. 

The Radeon RX 460, according to AMD is positioned as e-Sports gaming graphics card, based on the Polaris 11 GPU. The card lacks a PEG connector and is powered so directly from the PCI Express slot, representing a TDP of around 75 watts. The RX 460 has 14 CUs with 896 shaders. The reference model includes 2GB of GDDR5 and a 128-bit memory bus, this actually was 16 CUs a while ago in another presentation.
  

 
Finally, AMD has (virtually unchanged) roadmap again displayed during the press conference. Herein we see that Vega will be launched with HBM2 around the years end. The only thing added is the phrase "A high-end architecture for high-end gamers. According to the latest rumors, the RX 470 and RX 460 cost $149 and $99 respectively. The exact launch date of the RX 470 and 460 is not yet announced.