Unfortunately, such a feature does not exist.  And even more daunting, some things are not even announced in the blogs, but in a forum post that quickly gets buried due to the large amount of community activity.  (Which is good for the community.)  What would be nice is for the DNN Newsletter to be sent out more often, but highlight the new features and DNN roadmap/community news-worthy items.  Such a newsletter would have links directly to blog and forum posts with feature announcements.  This would give everyone a single and consolidated point of attack on keeping themselves up-to-date.  Otherwise, we are all subject to the act of "wading" through items that may not be important to you. However, I do find that nearly all of the "look at me" and "this is interesting" blogs still have to do with DNN.  So, on a whole, they are still valuable to the overall community and DNN roadmap in letting us know what Core and Project Team members are thinking about.

As I mentioned in the first post, the list from the Gemini is full of bug fixes that don't really tell me anything new unless I had encountered the bug and the features are not explained at all.

It doesn't seem like making a list of new features with a brief description is that big a deal. I do it on a regular basis for projects I release.  Nearly every other peice of shareware I have ever used has a new features in each version.   It is certainly less effort than putting together the news letter that comes to my mailbox periodically.

Setting Up WAP
http://www.adefwebserver.com/DotNetNukeHELP/DNN4_WAP/

I agree that new features are not documented well enough upon realease.  A short description in Gemini tells us nothing about how to use the new feature, the best use cases for it, etc.  The lighter side is that I see new features blogged about a lot more, but unless the frequency gets better, this still leaves us with the same problem - as only the most popular features will be explained.