As far as I'm aware there has been no confirmed date but last year (well technically this year) the first one was on January 12th, so it will probably be around the same time.
A month between roadmaps then, hopefully the wait means there's some juicy new additions to kickstart the year.
We need to consider Xmas and staff reductions as people take off the week before, during Xmas or week one of new year. I wouldn't envisage more than a couple of shuffle abouts
Aren't you forgetting that they don't put everything that's in the works to the roadmap anymore, though? If the drip feed continues then beginning of the year would be a good chance to reveal more content, especially since the German route will probably release soon after.
Now they’ve teased us about an upcoming British route, it would be folly not to include this in the next roadmap otherwise the stream will be full of “tell us what the route is” comments all night and the mods are going to have their work well and truly cut out.