The sandwich consists of a charbroiled salmon filet along with tartar sauce, lettuce, and tomato on a honey wheat bun.
The sandwich was spotted in Santa Ana, CA by one of your fellow BrandEaters, Kevin, who tried it out and was kind enough to share some photos.

"It was fairly good. It had a decent salmon flavor and I think some dill though it wasn't very strong. The texture was good and firmer than their previous charbroiled cod sandwich. As a person who isn't a big fan of white fish, I was happy to see salmon as the protein. It cost me $7.18 (without tax) for a medium combo."

A salmon sandwich would stand out quite a bit against the usual cod and/or pollock that most fast food chains stock around this time of year.
Photos by Kevin.