During the E3 2019 Nintendo Direct, information about the Marvel Ultimate Alliance 3: The Black Order Expansion Pass. A $19.99 pass is available, and it will release more characters starting over the next year. It turns out, these extra characters will include people from the X-Men, Fantastic Four, and Marvel Knights.
Exact dates for each group was not released. However, the first DLC pack will appear in Fall 2019. The second has a general 2019 release window. The third will show up in 2020. People who pick it up get a Deadpool chef outfit in an alternate color.
Here is the Marvel Ultimate Alliance 3: The Black Order E3 2019 trailer.
Marvel Ultimate Alliance 3: The Black Order will come to the Nintendo Switch on July 19, 2019.