Quite a lot as it happens:
- You can now associate website content by the country per-domain, per-subdomain, or per-directory level "“ very useful indeed. It will be interesting to see how useful this really is.
- View and block potential Google sitelinks. I have experience of this taking two weeks, very useful if you have out-of-date sitelinks
- You may like to submit multiple sitemaps to Google's Web Master Central, now you can.