PoC‖GTFO is a roughly quarterly journal edited and published by the Tract Association of PoC‖GTFO and Friends: a partially anonymous group of computer security researchers and academics. New issues are published whenever a sufficient number of articles are peer-reviewed, accepted, and edited.
Unlike other computer security publications, PoC‖GTFO strongly emphasizes hardcopy distribution; issues are always distributed first in hardcopy, typically at large computer security conferences. To accomplish this, issues are distributed under a «самиздат» license, which encourages readers to “bookleg” copies and set up digital mirrors. Typically, digital copies are released within a week of the initial hardcopy distribution. The Tract Assocation of PoC‖GTFO does not have its own centralized website; digital copies are seeded to a handful of mirrors (including this one), which then spread virally throughout the readers' mirrors.
Also unlike other publications, PoC‖GTFO has a clear editorial goal of supporting “Junk Hacking.”
In order to stay abreast of new issues, you would do well to follow Travis Goodspeed's and/or my own Twitter feeds.