Re: When will there be an update
Because of there being an extra two months compared to BOG, I can't match them up exactly, but I've been keeping an eye on:
-Wednesdays: this is when Weekly Jump spoilers pop up due to there being places in Japan that put out the following Monday edition early; if there's a new article/ad related to DB15 in Weekly Jump, it'll most likely appear on a Wednesday
-Jump Festa's official page (though they're still setting up for their 2015 edition) you can find them here:
http://www.jumpfesta.com/top.html
I recall them having BOG-related preview stuff there.
-2ch threads (the one I occasionally check in on for DB15 is here
http://anago.2ch.net/test/read.cgi/moeplus/1405753335/ though most of it atm is also just speculation. Warning though, after they hit 1000 posts, they create a new thread and delete the old one within 24 hours, but typically link to the new one at the end of the old one).
-The "page info" function on
http://dragonball2015.com/ tells you when changes were last made to the site. Nothing new there since July 24th as of this typing though.
-VJump; the magazine comes out the 21st of the month (normally). Shops tend to be better with VJump than Weekly Jump in regards to not breaking street dates. Usually won't be until several days after the release date for VJump when new movie-related stuff appears online.