Bleeding Cool dug up a bit of information that looks like the rumors we are hearing about Nightwing appearing in Batman vs. Superman could be true. It seems Warner Bros. has registered the image "Nightwing on a Bat" in a major way, for use on a variety of merchandise. Usually we see this when all variety of clothes, toys, and more flood the shelves along with a huge movie.
Whether "Nightwing on a Bat" is some sort of Nightwing symbol over the Batman symbol or closer to his comic book logo remains to be seen.
And here is what "Nightwing on a Bat" has been registered for:
Clothing for men, women and children – namely, shirts, t-shirts, sweatshirts, jogging suits, trousers, pants, shorts, tank tops, rainwear, cloth baby bibs, skirts, blouses, dresses, suspenders, sweaters, jackets, coats, raincoats, snow suits, ties, robes, hats, caps, sunvisors, belts, scarves, sleepwear, pajamas, lingerie, underwear, boots, shoes, sneakers, sandals, booties, socks, slipper socks, swimwear and masquerade and Halloween costumes and masks sold in connection therewith.
Toys and sporting goods, including games and playthings–namely, action figures and accessories therefor; play sets for action figures; plush toys; balloons; bathtub toys; ride-on toys; equipment sold as a unit for playing card games; toy vehicles; dolls; flying discs; hand held units for playing electronic games other than those adapted for use with an external display screen or monitor; game equipment sold as a unit for playing a board game, a card game, a manipulative game, a parlor game and an action type target game; stand alone video output game machines; jigsaw and manipulative puzzles; paper face masks; skateboards; ice skates; water squirting toys; balls–namely, playground balls, soccer balls, baseballs, basketballs; baseball gloves; swimming floats for recreational use; kickboard flotation devices for recreational use; surfboards; swim boards for recreational use; swim fins; toy bakeware and toy cookware; toy banks; toy snow globes; paper party hats; and Christmas tree ornaments.