"Sequel talk" refers to conversations or discussions about the possibility or planning of creating a follow-up or continuation of a book, movie, or game. Full definition
This is not the reboot the studios hoped for (though sequel talk keeps simmering away). (dvdtalk.com)
It had a better and more famous supporting cast, was notably bigger at the box office, and had sequel talks going on for awhile (I think the idea of a sequel was recently canned after Jolie said she doesn't want to do a second film, actually). (incontention.com)
The new Independence Day movie isn't even out yet, and already sequel talk is a thing that's happening. (themarysue.com)