so.. is it gonna do 1400 sols/s per card as well?.. 
I doubt it. The Ethereum hashing increase is from the new memory interface utilizing the HBM2 memory type. This is what will radically speed up the ETH mining. However the core is most likely nearly the same or hopefully close to the nVidia 1080 ti, so if this card got around 700 SOLs that would be quite a bargin as the card is about half the cost of the 1080 TI.Faster ETH
Same Equihash
A little less power
30-50% less price (depending)
All those stack up for a hell of a deal!
I fully agree ETH is more memory speed oriented with HBM2 which is in my opinion even better than next gddr6 for mining, we can expect about 70MH, while ZEC is more core speed oriented and vega 64 will be same as 1080ti or lower, we can expect about 680-720sols on 64.
Edit:
Dont get it why was people thinking that vega 64 will mine about 35MH same as FE (which doesnt have drivers, isnt optimized in miners, and overclock) vega 64 have about 120% increase on memory speed over rx 570, but again 64 is using 300wats, and costs about 500$, at the end it is the same thing