Ok, this post is lazy. I admit it. I found a nicely-written blog post that describes two of the sessions that I attended where RDA was discussed. I'm not sure who Steve is but I think that he captured the content of those sessions well:
Not to be completely lazy, I was a blogger for ALA Mid Winter as well. Here is a blog post that I wrote for the Copy Cataloguer's Interest Group that fills in some of the gaps that Steve missed. You can read it at: http://www.alcts.ala.org/metadatablog/2012/01/copy-cataloging-interest-group-jan-21-2012/
I hope that you can access my blog post without being a member of the metadata bloggers group!