I don't know if this is new or not, but I just noticed that the Dutch Tree was expanded/updated! Time to try it! :D
Same here also! I wonder how I missed it since I was on the duolingo forum nearly all day yesterday...
Hi, the newer, updated version of the Dutch from English course was recently rolled out to a certain percentage of the course's leaners for A/B testing, and it seems your a part of it.
If you haven't already, please see this discussion post for clearer information:
I went to the Dutch lessons and found out that I no longer had a few to do to get the tree, but had almost half the course to do.