Not MCU related, but Marvel related.
If you are unaware, Marvel has a whole Civil War 2 crossover event in the comics this Spring/Summer.
They have now started teasing the next crossover after that....

All the discussion of Marvel crapping on characters that Disney does not own the movie rights too seems to be coming true again (see cancelling Fantastic Four comic, they made Spiderman Doc Oc for a few years, the have been changing the origins of Mutants to Inhumans for grins (see Scarlet Witch/Quicksilver), they have made ALL the X-men and mutants sterile so they cannot make new mutants (and give Fox more characters to play with), etc.
This first hint seems to indicate a "death" of the mutant "universe"....