I just manually saved that from an auto spambam for you. As a warning: a post which is just a URL has a higher than even chance of automatically getting your account banned by the system because it looks exactly like a spam post. I caught it this time because I happened to be looking just now.
Anyway, here's the post from WotC's Twitter account via a website via a forum thread:
"Sadly, the gnomes made a strong case for time off this month. There will be no Unearthed Arcana or Sage Advice articles published this December. We'll be back with full #DnD technomancer support in January!"