I suspect that the whole body of knowledge is going to be disclosed although I presently see no evidence that a new body of theory has arisen yet. It remains purely empirical so far.
It is also reported that our realtionship with these folks is not overly cosy but also somewhat cooperative. I think that full disclosure is way overdue.
Dying Senior Scientist Shares Insider Truth About Area 51, Extraterrestrials, UFO’s & Anti-Gravity