Nice idea. One piece of feedback though: I'd rather see a list of actual features , rather than a list of blog posts. In this implementation, I'd have to click through to each individual blog post to figure out everything that's changed.
From what I can tell, this is just a script that presents whatever RSS feed you throw at it (for a fee, no less! ;)
So presumably the solution would be to point it to something like "rssfeed.php?category=newfeatures" or some such custom concoction.