I thought the video was really interesting, and especially liked the demo with the calendar feature.
However I think it is important that the common store can easily be kept in sync with multiple machines. In fact the main reason I moved to Small Business Server for my home network was to keep outlook in sync between my main PC and Tablet.
However I feel that a sync feature for the RSS common store should be a built in from the beginning. Including the ability to sync your office and home machine, like in RSS Bandit, as well as a more continuous sync option, like you get with Outlook and Exchange.