The list is not conclusive and it may contain items that will not make it, and other items not described here that would be included, in other words this is not a "definitive" list, but here it goes:
1. RSS Feeds
2. "Mobile" version
3. Email Functionality (updates on Q &A )
4. (Possibly) new skin
5. More robust search capabilities (currently search is performed on tags only not on content).
That it is for now, feel free to drop your requests in by opening a new topic, cheers