One concern: Wish I knew what PC specs are necessary to play Fallout 4 with he same graphic settings we see in the previews.
This one is tricksy, since unless a demo shows clearly that it is running on a console it is probably running on a PC (and a very powerful one at that). I don't think it is common any more to run demos on a dev kit (huge risk and first parties put in the contract that dev kits will never leave the dev's (secure) workplace).
There was a fair bit of deception in the presentation.
You could, however, built a PC that is roughly equivalent, or even more powerful than, one of the newer consoles. A quad core processor and 8 gb RAM should beat the console slightly (and also requires a 64 bit OS). The graphics card (probably the best component on a console) is where I'd have to guess and say at least a GeForce 450 or rough equivalent (but better would be better).