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You may notice under the "License terms" heading, Microsoft's friendly joke: "Make our lawyers happy by reading this carefully". Of course, these are subject to change as the development progresses, and should not be seen as the final license revision.
Ugrade options are available in this developer build, with users allowed to migrate their accounts and personal files -- or simply nothing at all. However, it is not clear exactly what is migrated. Later on, you will see cloud-based roaming profiles which allow users to login with one Windows Live ID and take their applications and bookmarks with them.
Windows setup keeps the user firmly in the loop. If it is working on something, it makes it clear. Yet, if Windows setup requires something from the user, it will say so. But on the most part, once Windows setup is busy on something, it will stay so for enough time to get a hot drink.