Speaking to the BBC, Marvel Studios president Kevin Feige says plans are in motion to use Captain Marvel as a way to introduce yet another Marvel superhero.  The character in question is none other than Ms. Marvel, the MCU's first Muslim superhero.  According to Feige, the arrival of Ms. Marvel "is definitely sort of in the works." 

He continues, "We have plans for that once we've introduced Captain Marvel to the world."  With the Captain Marvel movie headed to theaters on March 8, 2019--and the superhero played by Brie Larson set to help close out Phase 3 in Avengers 4 on May 3, 2019--that clears the way for Ms. Marvel to possibly be introduced in a Captain Marvel sequel. 

In the comics, Ms. Marvel is actually Kamala Khan, a Pakistani-American sixteen-year-old who idolizes Carol Danvers.  After discovering she has Inhuman genes--much like her hero Captain Marvel, she takes up the Ms. Marvel identity Danvers once went by.  She was first introduced in the comics in 2013.