Britain already started releasing their secret UFO files, I believe they started the project in 2008 of releasing the info. Supposedly it's going to take a few years for all the files to be published. Here are two new stories about it:
http://edition.cnn.com/2008/WORLD/eu.../britain.ufos/
http://www.ctv.ca/servlet/ArticleNew...ub=CTVNewsAt11
And here's the UK National Archives website where the files are being published:
http://ufos.nationalarchives.gov.uk/