Tombstone, the Chameleon, and Tarantula are being considered to appear in Sony Pictures' Silver & Black, according to The Tracking Board's Jeff Sneider. Take a look:
Since I slipped the word "chameleon" into my Riz Ahmed/Venom story, I've heard the character could very well show up... in SILVER AND BLACK!— Jeff Sneider (@TheInSneider) August 12, 2017
Have also heard TOMBSTONE and TARANTULA for SILVER AND BLACK. I don't know much about those Marvel villains, but they sound interesting...— Jeff Sneider (@TheInSneider) August 12, 2017
None of the three villains have appeared in a live-action film before, but all - save Tarantula - have been in varous Spider-Man animated series.
A new Tarantula surfaced recently in Dan Slott's Amazing Spider-Man run as an ally of Black Cat, the "Black" in the Silver & Black title alongside Silver Sable.
Silver & Black is scheduled for a February 8, 2019 theatrical release.