Just me speculating, same as you. There's no doubt deathclaws will be bullet sponges and distance being your best friend. I agree about the tedious Bethesda fights, but I'm guessing deathclaws will be dealing more damage this time around.
Needing power armor to fight deathclaws would definitely svck for light armor users, unless there is a light armored version of the power armor being that it looks to play a significant role this time around.
One thing I wonder is what exactly triggers the deathclaw's new animation critical hit (could possibly be a fatality kill) where they lift you in the air and uppercut slice you as shown in the reveal? Is this something that happens when you're low on health and the deathclaw gets too close? If it is, what is the timing between the PC successfully popping another stimpack and the deathclaw animation being activated before you could inject the stimpak?