Still, my head cannon believes that the Superlaser took up too much power and they had to balance it with the hyperdrive. So off it went, a standard heavy laser cannon was installed for the production version, and we ended up with the B-Wing we more or less had from the expanded universe. Any Superlaser-touting B-Wings can be passed off as a limited production version, about as common as the old B-Wing/E.
Well yeah that's exactly what they did to change the B-Wing. Note that the frame and shape is just WAY freakin' larger- like, ridiculously so. You wanna' see some Rebel Production-Run B-Wings that may appear in the show? Here ya' go..!