But does he know?

He has said he'll play Fallout 4 on release multiple times.  That being said do we know if he's aware that LotV comes out on the same day?  It's possible he'll change his mind if he's not aware of the conflict yet.

Personally I don't care if he digs in day 1 or not.  I'm sure he'll get to Legacy of the Void all in good time.  Plus if he waits it will give me a chance to make some progress on my own so I don't have to worry about spoilers.  ;-)