Looks like they're just unfolded. His arms come from a lamp, usually they're folded at the elbow and locked in place.
I'm talking two struts left and right. I built a Crow about ten years back so I'm very familiar with how he goes together.
Old!Crow had arms that were one strut wide amd two struts deep, with a single foam pipe insulator on the rear strut of the bicep and the front strut of the forearm. New!Crow has double the number of struts, with two struts side by side as well as two front and back. There's now two foam pipe insulators on the rear struts of his bicep, and it appears two on the front of his forearm as well.
Basically, old!Crow used four struts in total to build his arm, new!Crow has eight.
Edit: For comparison, here's a promo pic for the new series using the old design:
