I Am Legend 2 is in the works, and audiences may find that the zombies – or Darkseekers as they are referred to in the film – will look entirely different than they did in the first movie. Filmmaker Akiva Goldsman has confirmed that the film will see the return of Will Smith as protagonist Robert Neville, and that actor Michael B. Jordan will be joining the cast in an unknown role. This is certainly exciting news, but it was the other tidbits that Goldsman revealed that hint at significant changes for the upcoming film.
https://screenrant.com/i-am-legend-2-zombies-different-good-reason/