I've been wondering the same thing. I like the Sako AIII/AIV/AV series rifles in 375 H&H MAG and the Weatherby Vanguard is a similar design. I know Howa made the Howa 1500 in 375 Ruger for a while, but I would prefer the 375 H&H MAG given the choice.
Nice to see the Vanguard is coming in the version with the upgraded stock, if it works well it'd be a great rifle.