The logic here is that we have provided "6to7" script for you to make the test drive of it, but not to upgrade your site actually.

Means you do "upgrade", using giving instructions, of your site and see how the upgrade script will work or not (were profiles and their photos transferred and display correctly, etc, etc, etc).
If it works then report that, and if not then do the same, so we can do enhancements and fixes to it before the official announcement of the full-working see more upgrade script.