Well, there is no specific information for the start of season 2. Last we heard was that we get news in the “coming weeks” (Vermintide 2 - Patch 2.0.14.1). Weeks already implies that it will most likely not be this week. And new again implies that after the news, the start of season 2 itself will also take at least one more week. But maybe they just drop everything tomorrow. For now you should expect a December release.
As for Drachenfels, the release will be splitted (Winds of Magic - Season 2 Blog Post). First map will come “at the start” of Season 2. While the other two will come later. Lohner’s Emporium will also be there with the start of season 2.
But again, the start is most likely still away. This also depends if FS wants to integrate results of the survey already in Season 2 or if the survey is already aimed at Season 3. Hard to say at the moment. Just stay patient and enjoy the combat, talent and gameplay improvement 2.0 has brought.