Future PDFs will be okay after 30 days of release.
What?
The default rule with integrated new PDF releases into the Missions line is that they're kosher a month after their release date -- so that GMs have time to read them over and get acquainted with whatever new stuff is inside, instead of being blindsided by a player sitting down and buying a Buster Sword or nuke grenades or whatever's in the latest gear book.
Note that this is not necessarily the case for
Way of the Adept and future Shadowrun Options books, because, well, they're called "Shadowrun
Options" books, and everything in them is optional (which means, by default, disallowed in formal Missions events).