There are a few things I am interested in seeing in WHS:
1) Support Raid 5 - I'm hoping that through some kind of advanced configuration, I can setup a Raid 5 array and actually store the majority of my music, movies, pictures, home video, etc in one single location. If ti's possible it would be nice to have some kind of email notification if there's any problems with the array
2) Support for Routing service - a WHS box would be idea for acting as the internet gateway but without some kind support for advanced routing (such as port forwarding) getting the most out of applications like skype will be tough. If the majority of the services are only going to be focused on backup, maybe call it "windows home backup server" which might actually help sell the product
3) Built in Sync functions - windows synctoy is nice but how about having sync, contrib, etc functions running from the WHS. I would like to come home, connect my digital camera, download the pictures and then have them moved automatically to the server so I can view them from any pc or the HTPC in the living room.