They are teasing Carnage's son, Toxin.
Rented it this morning, and it was pretty dumb, but fine. I do enjoy the Eddie and Venom banter, Hardy is well suited for the characters.
The post credit scenes of this film and Spider-Man just seemed collectively like a flex from Sony. Showing everyone that Venom and Spider-Man are their properties but I don't see them putting Venom into the MCU at this point, but who knows. Sony is going to do a Kraven film and Morbius, it feels more likely that Venom would be used to help those properties. After the reception that Andrew Garfield had from no way home I do think it would be interesting if they did something with him as Spider-Man in relation to Venom and for the MCU and Sony to keep Holland separate. Having another revenue stream for the same character.