Reading the planet and several blogs regularly, and also testing 11.10, it still is not clear to me what is planned for Unity in 11.10. When going to 
launchpad, no blueprints are available and the open bugs are mostly just fixes or backlog from 11.04.
That makes me wonder what is planned for unity in 11.10 at all? Is there any public documentation available about this topic? Or could some developers make a statement here?
It would undoubtedly be very interesting for many to get some information on this!
They'll be distributing it with both Gnome 3 and a slightly-closer-to-ready version of Unity,
So, Unity will be able to display progress bars, notifications and little circles with numbers on the fly, like you might see in a Chromium-style plugin. I know, sounds small, but it's something. Third parties will also be able to write their own "lenses", which will let you search, for example, Youtube from your desktop -- IE, the search that happens when you hit the super button -- and browse interesting content from there.
They're going to integrate the Software Center with Unity a little more, not that I have any idea what that means.
I found those new features in these article: http://www.techdrivein.com/2011/05/6-important-changes-in-next-ubuntu-1110.html, http://www.junauza.com/2011/05/ubuntu-1110-oneiric-ocelot-features.html. But I'm sure there are a couple more features (mainly focusing on integration) in the works, as well as a nice pile of bug fixes. You'll also get Unity 2D, but I doubt you particularly care, unless you run a 5-year old 11 inch laptop.