It would be great if this product is going to be a true home server product for the small installations where you do need to full power of a AD domain:
1) A low e-mail server, Exchange lite, that will allow you centralize your e-mail or even better host a 10 mailbox store.
2) The ability to backup to tape or optical. Housing this amount of data in a single location with backup solution that is not on a spinning head drive is a must. We need to ba able to backup the server and store off site. If you place this on a external drive you are still bound to the problems of HD's, drive failure.