Earlier last year, President Obama made a statement that resulted in a press release by the uk's Daily Mirror titled;
`Barack Obama 'will reveal alien and UFO details held by the US before he leaves office' source
well here it is: https://www.cia.gov/library/readingroom/collection/crest-25-year-program-archive
and here is an article supporting it: zerohedge article
probably less than we were expecting but someone is bound to make a documentary on it sooner or later. (if this has been on the mainstream news already i apologise, i don't watch it)