Board Thread:News and Announcements/@comment-28288412-20161006192647/@comment-410526-20161011205919

THey said they were putting finishing touches on it down to the wire, not that it was necessarily unfinished. I assume that's minor stuff that just makes it that tiny bit better before release.

Judging from the behind the scenes commentaries and such, I get the sense that almost all RWBY productions go through revisions literally up to the day before they are posted, but that's not to say they're only completed on the last day, just that things are still being improved upon. Sometimes the process continues even after the episode is released, with the initial release on the Rooster Teeth website being ever-so-slightly different to the YouTube upload a week later (and also changes between the YT video and the final DVD/BR version).