So half a year from December would be about May...
Having mixed feelings about this, although I know it will be better in the long run with less balance patches and such, I was hoping for Brink by March for some reason.
The quote doesn't actually say "6 months from December". It gives the impression that they were originally planning on releasing it before Christmas, and could have extended that until just before Xmas, but that wouldn't have been balanced, so they extended it past Christmas for "months". Its all worded very vaguely.
Either way, the fact that SD isn't giving a date means that they aren't sure when it will be ready for a release, but it also means that they aren't planning on waiting till Beth's deadline, or else they would just say that the deadline was the release date.