I finally had time to take a look at it. The CTP version. Virtual PC image is almost 8GB big and needs slightly more than 1GB of RAM.
Just a quick look for 5 minutes - I'm satisfied.
Workflows are now designed in web client, they support update (you can choose columns) and delete actions.
Duplicate detection - not perfect, but still better than nothing.
User interface - better looking, but still some icons missing
Multiple languages - Cool feature for exporting and importing the published field names, attribute values, ... for translation purposes
Web services - Now you can download WSDL from web client. I'm not sure if this is really useful feature. Or is it?
Will write more later.
Update: David stressed a good point about downloading WSDL in comments: CRM Live