Believe this is one of the few vendors left making and distributing Linux magazines still(?). Would be interesting to hear what peoples feedback on these are, whether its this one or another. Seems like a fun monthly delivery to get!
Source; https://www.magazinesdirect.com/az-single-issues/6937009/linux-format-magazine-single-issue.thtml
Probably just the design, this one is specific is the magainze release of April.