My understanding is that after 17th June, names of 8 characters or more need to be registered via the faucet to avoid the prefix. Up to and including this date 8 character names will be fine, even if the faucet wasn't used.
I haven't seen this June 17th date, but let's assume that's correct, then it should go something like this ...
All 8 char names reg'd before June 8th will migrate as-is.
All 8 char names reg'd after June 8th up to 2.O will be prefixed at migration.
All 9+ char names reg'd anywhere before June 17th will migrate as-is.
All 9+ char names reg'd at the faucet after June 17th will migrate as-is.
All 9+ char names reg'd anywhere else after June 17th up to 2.O will be prefixed at migration.
Is that correct?