I guess it was decided not to update CK2 to 64 bit and instead to let it run out. So the remaining budget is used for bugfixes and stuff too small to sell as DLC.
On one hand its sad it is ending, on the other better end it this way than to get feature bloat and 3 button DLCs like in EU4.
A whole new Startdate used to be considered a new DLC in the past. So it’s weird they give it away for free.
I’m not complaining tough.