I think the QR idea is great, specially if we want to direct people into contribute or know more about a specific topic (ex, the design flyer QR should link to the Design team wiki page, and stuff like that...)
Now, about answering the question "what's Fedora and what's Linux?" in a single flyer I see that at the end, there will be too much content and we might need a 2x2mts flyer. then let me offer you guys an option... What about a video that explains the difference and where users can identify themselves (which will also reduce the time that you spend explaining each one and will let you reach a bigger audience) and then, deliver the specific(s) flyer(s) that can make this person get really interested in Fedora?
Now; if we want to get even more crazy... what if we develop a simple website/web-app that let users select their profile and their personal data?
Profile such as: student or professional, designer or coder... if designer? photographer, music or all? ... and go on
Personal such as: NA, LATAM, APAC or EMEA? Housewives or Police? if Housewife, how many Pc's are at your house? are yours? tablet? etc...
At the end, probably in 6 months of release parties and other events, we could not only be able to identify what audience do we reach the most (or which users are more interested), but also a demographic about the situation and how does our users make use of the tools that we are offering. This might sound crazy, but I guess that at almost each community there is someone with a Tablet that can be used as "our touch device for users help" (touch please... no click click :D )
Anyway, some random ideas :)