Things change all the time. This is where we talk about those things.
Basically, here is a list of changelog messages, created by the folks that care about such things. Normally a person will have a beat, but anyone can post a new changelog: just share the announcement link, or write it up if a project doesn't have a blog (make sure to mock them in the process).
Aside from the announcement link, you might also add in something you are excited or disappointed about. That is the real conversation starter. Be bold. Help your fellows stay informed! And learn about new things that are changing that you didn't even know about. ^_^