I was looking at the picture, and once you get past the deathclaw cage there seem to be a lot of new building pieces.
Curved concrete walls
Flat concrete walls with framed door openings
Concrete walls with chainlink fencing
metal railings
mesh flooring
concrete roof
A Very Large Generator
Traffic Signals
Light bulb strings
what looks to be a street light
placeable trash can fires
something that looks like a heater...
I would assume that if this stuff is in the picture, then it will become part of the workshop stuff. If so, can't wait!