The phrase "new pamphlet" refers to a recently published booklet or small book that contains information, ideas, or arguments about a specific topic. Full definition
A media information campaign was carried out, and a series of new pamphlets was issued, including topics such as driver's licence suspensions, bail, and a general pamphlet on SLS. (slsedmonton.com)
and his father Barry Mizen now works as a spokesman for the charity, contributing a chapter to the Fabian's Society's new pamphlet (nextleft.org)
I've had a quick read of Will's new pamphlet. (nextleft.org)