Disney is in talks to buy 21st Century Fox. This could mean that the X-Men are coming to the MCU.
https://www.cnbc.com/2017/11/06/21st-century-fox-has-been-holding-talks-to-sell-most-of-company-to-disney-sources.html (https://www.cnbc.com/2017/11/06/21st-century-fox-has-been-holding-talks-to-sell-most-of-company-to-disney-sources.html)
http://variety.com/2017/film/news/disney-fox-rumors-murdochs-1202608371/ (http://variety.com/2017/film/news/disney-fox-rumors-murdochs-1202608371/)
Not to mention F4 too.