Colleen, as you may know, we are a young and fast growing company. We are known for our very fast feature releases, bug fixes, and fast moving roadmap. Therefore, we are improving our product everyday, and once we have something ready to implement, we release it asap.
However, if there is any big changes that affects the functionality of our customer's communities, we always make sure that we make an announcement to inform our customers regarding those changes.
We usually send a chat message or an email message to the community admin. We list all the new features here6 in our community. Also, we share the new updates on our monthly newsletters.