First, from the PPTQ
fact sheet:
Formats for Preliminary Pro Tour Qualifiers vary by location, and can be one of the following formats:
Modern
Sealed Deck with a Top 8 Booster Draft playoff
Also, the
MTR has been updated.
Appendix E has a chart showing Swiss rounds based on attendance; of special note:
8 players - 3 rounds, single-elimination (no Swiss, no playoff)
9-16 players, Limited format - 4 rounds, Top 8 playoff (per fact sheet, booster draft)
9-16 players, Constructed - 5 rounds, Top 4 playoff
Sorry for the confusion, but the intention was to change the round chart in the MTR to match the GP/PTQ version, and to do so per the normal update schedule; because of the many requests, Scott Larabee accelerated the release. Just for you! :)
d:^D