[Complete] Scheduled Game Update - August 6, 2013

Imo it either has to be this patch, or september, but september is pushing it a bit since if we start RED in december, that leaves us no time for the Cygnus Returns patch (since theres 3 seperate parts of course)

Edit: I suppose we could always start RED in January though. Bear in mind we do already have some things from Masteria in our patch data which arn't ingame yet (like the aforementioned bigfoot)

I doubt it is in this patch. Nexon loves to hype and they haven't mentioned Masteria anywhere. Battle Monster League is coming soon, that's a given. Because all the other versions are getting Battle Monster League.
Cygnus Returns was 3 updates for KMS because at that time they were still developing the skill changes. Maybe GMS will incorporate all three revamps into one patch.

[SPOILER=What's coming in August for GMS]

Since RED is a tier 2 update (major update), it'll probably come in the winter season for GMS.