From what I understand there won't be any content updates anymore, so after this DLC it might well be the end or maybe another DLC in the future, who knows.
Mostly a fully fledged Autumn season with new weather cycles/dangers and possibly some spring only events to make a full cycle of seasons. I always found it a shame that only summer and winter have gotten their features and time in the spotlight.
That is great news Bigfoot, truly an end to a fun period and I say thanks for making it possible to enjoy a great beta experience. Enjoy your well earned break and I look forward to seeing what is next.