40 MH/s on overclocked settings. Probably 45-50 Mh/s with BIOS mods and driver optimizations?
Vega Bios is locked, Gamer Nexus stated this on their review. Maybe AMD will focus their drivers for mining after they see that only miners want to use this card as it's a bad cost benefit for gaming.
This card will be very good for those who don't pay energy. Anyway, ETH miners should be scared right now.