Given the Bethesda track record so far I would say no. After seeing the trailer I would pre-order for Mac today if there was that option but alas there isn't. Human Head also has in the past made Mac versions of their games, but I suspect the ball is in Bethesda's court as to if that happens or not.
To be honest I've had to rely on myself to play the games I want on my Mac and port them over using Wine or Cider, which work quite well, pretty close to native in most cases. I'd much rather support the developers by buying a native Mac version rather than acquiring them elsewhere and porting them over myself which can be hit and miss depending on the quality of the PC code.
Here's hoping that there is some good news at WWDC.