Deadpool Joining The MCU

According to ComicBook.com, While much of the current X-Men movies cast is expected to be rebooted and recast during the transition from Fox to the MCU, Ryan Reynolds' Deadpool is likely sticking around, and will have to find his place in a whole new playing field of Marvel characters.
Avengers: Endgame directors, Joe and Anthony Russo told Fox 5 DC, it's the character of Deadpool (more so than actor Ryan Reynolds) that will be a big change for the flow and tone of the MCU as we know it.
Joe Russo explained saying, "He breaks the 4th wall so it changes tones.”
Given the unique nature of Deadpool’s character, executives at Disney could give Deadpool the split focus treatment, wherein a toned-down version of the character appears in the MCU-brand movies, while an R-rated version continues under the 20th Century Fox banner.