To those of you who didn’t find the last post quite as exciting as I did, perhaps you’ll appreciate what the new architecture allows when you hear about its first feature: Customizable RSS feeds.
Users can specify a custom set of topics from which their personal feed will draw recent posts. Currently, users can specify a maximum of 40-100 topics (the exact number more or less depends on the total number of topics in your forums) to follow. If a user adds too many topics, the first ones added will get bumped off the list.
You can check it out by visiting your user profile in the most recent copy of bbPress (and, yes, better upgrading scripts are on the list!).