At risk of invoking the proverb, I'm going to make the assumption that your question is specific to this year, UFO's and cover-ups.
I don't believe we are going to see any disclosure from the U.S. government regarding UFO's. One of the main justifications for keeping the public unaware of UFO's, according to many in the field of Ufology, is the fear of widespread panic that the government would be unable to stop them if they were hostile. Indeed, if visitors are able to travel across the vastness of space, a feat we still can not accomplish, in order to get here then it seems unlikely we have the technological means to stop them if they are hostile.
With that said, I think if the government wished to disclose that aliens have been visiting us, it would probably be over a very long time. If they were to just come out and say "You were right, we've been covering this up and they're here," many people would be in shock or simply not believe them. Therefore, any disclosure would likely take place gradually over a period of many years. A few documents here, a few there. Maybe a paper from a 'think tank' discussing the implications of "what if," etc. to slowly warm up the public for a final revealing press release.
Since I have yet to see or hear of any documents recently being declassified, or any other indications that the government is thinking about the subject, I'm forced to believe we wont have an official disclosure any time soon. In the meantime, as far as the truth, we'll just have to keep our eyes to the sky and make up our own informed decisions.