Michael B. Jordan's role in I Am Legend 2 has yet to be confirmed, but some hints from the book could indicate that he will be joining the ranks of the Darkseekers in the upcoming sequel film. The movie will follow the alternate ending of its predecessor, in which Will Smith's character, Robert Neville, discovered that the zombie/vampire-like Darkseekers were capable of love and connection. This ending was a little more like the original I Am Legend book and allows for far more opportunities for the Darkseekers in I Am Legend 2.
https://screenrant.com/i-am-legend-2-michael-b-jordan-darkseeker-theory/