The number of campouts required to reach Second Class was changed to the pre-2016 number, effective 08/01/17,
2017 Advancement Changes are as linked.
New Rank Requirements became effective January 1, 2016.
BSA has posted two PDFs on its "Program Updates" page with the final wording of rank requirements which became effective January 1, 2016: http://www.scouting.org/scoutsource/programupdates.aspx .
One of them is a standard 8.5x11 PDF document. The second is the same document, but the PDF has the pages arranged to print 2 up, front and back, on 8.5x11 pages, to allow creating a booklet that can be inserted into a handbook.