It seems like a dig at 20th Century Fox for not being able to successfully bring the Fantastic Four to the big screen. But Marvel Studios' head Kevin Feige also seems like he's making a promise to fans who have been clamoring for the longest time to see these heroes get an MCU treatment. While speaking to Variety at San Diego Comic-Con 2019, Feige answered when asked about their plans for the characters, "All of that is spoilers, but I'm extremely excited about those characters, and about bringing Marvel's first family up to the sort of platform and level they deserve." Feige didn't specifically say when we can expect a Fantastic Four film (or maybe even series), but just acknowledging it now makes us excited.
Source: ComicBook.com