Well .. a little bit as it isn't much. On a new webpage from AMD that are teasing the new Polaris architecture. It's highlighting features as 4th gen. Graphics CoreNext, 4K H.265 60 Hz game-streaming, next-generation display engine with support for DisplayPort 1.3 and HDMI 2.0, XConnect Technology and GPUOpen.

On the page AMD also has a top leader image, showing a Polaris chip, you need to look hard though:

Then lower on the page there's this image:

Well, from there onwards is speculation. Is it Polaris 10 or 11. The upper one Likely 11 Baffin though and the lower one Polaris 10 due to its bigger size.

Polaris 11 will be a more mainstream model with the Polaris 10 to be a high-end SKU series. Polaris 10 is "Ellesmere" and Polaris 11 is "Baffin. We think it is safe to say that Polaris 10 will be the R9 490X series with 490 and 480 models (high-end). Polaris 11 will be the GPU replacing the 370 and 360 products, likely R7 470 and R9 470. It is unlikely that AMD will announce all products at once, so we expect Polaris 10 appear first around the Computex timeframe with an official launch later. Polaris introduces HVEC (h.265) decode and encode hardware-acceleration and will also support the latest display output standards like DisplayPort 1.3 (how does 3840x2160 @ 120Hz and 1920x1080 @ 480Hz sound?) and of course, HDMI 2.0.

AMD Shows Polaris 10 and Polaris 11 ASIC Images