Sorry for the delay. We're working on it (needed final versions and then to convert them to pdf's). I apologize for this taking longer than expected but hope to have some good news, in the way of posted presentations, shortly.
In the mean time, there are some discussions, blog posts and videos up.
Ariba UC content tag
YouTube Playlist from the User Conference
Here are the questions attendees submitted before the User Conference
And of course, if you have specific follow up questions or thoughts on the event or presentations, I'd encourage you to post a discussion here:
Thanks for your patience.