Re: Second ongoing Shingeki no Kyojin manga series?
Regarding release dates of manga. Not just in Japan but with many magazines in North America as well, the issue will often be released ahead of the season or month it is printed for. In the case of Bessatsu Shounen (Kodansha) and Jump SQ (Shueisha), they release the magazine on a set sell date to people who only buy certain issues, but they mail it out so subscribers receive it early. That's why we already have Edited Mangas two days before the sell date for those magazines. JSQ usually sells on the 4th of the month but Edited Mangas tend to appear before the first of each month. Even though ppl subscribed to JSQ were probably getting it in late July, however, it's still the
September edition of Jump SQ.
I wouldn't trust the light novels though. Those weren't written by Isayama himself and I've no idea if Isayama helps out the author of the light novels either.
I'm sure it depends on the series. For
D.Gray-Man, for example, the light novels are written by someone else but with *heavy* consultation from the original author (she's even got author notes in the books), and are therefore canon. Reading those can give you some great additional insight on canon characters.
What about the story, will it be full Isayama? a "collaboration"?
Good question. I hope we can get some word on that soon.