Thanks for doing that, way to go - if we can now motivate a few more people to get involved in doing just like that, we will actually have a nice newsletter at the end of this month, which goes to show that it's not exactly difficult to come up with a newsletter - all it takes is people to actually "care" a little, so that they can get involved in one way or another.
Just looking at the forum, the devel list and the commit logs, there really is tons of stuff currently going on, and it really isn't difficult to add relevant developments/news to the newsletter, or invite people to add their own projects to the newsletter.
However, many people feel a little "shy" about doing so, so they may need some encouragement - because most people feel that the newsletter is only edited by "core developers", whereas that's actually rarely the case at all - the newsletter is primarily written by forum users, and that's actually a great way to get involved without having to write any code.
Like I said a few weeks ago, I used to simply configure the forum search to show all threads/topics started (or updated) in the last 3-5 weeks, and then see if anything relevant shows up - and if so, I would add it to the newsletter, or in some cases reach out to the corresponding folks.