New HBP trailer in Japan – hitting US theaters Friday?

Japanese Potter fansite Pottermania has posted photos from what appears to be a brand new trailer for Harry Potter and the Half-Blood Prince. In them (no video… yet), we see several new scenes: Harry and Slughorn enjoying a party, Harry and Dumbledore in the cave, Bellatrix attacking Hagrid's Hut, and Snape on the Astronomy tower with Harry.

What's more, Portkey.it is reporting that the last full trailer for Half-Blood Prince is expected to premiere in the US this Friday in front of Inkheart. Could this Japanese trailer be one we'll see?

Please note that this is just a rumor for now, but we're currently trying to confirm with Warner Brothers. We'll keep you updated! Thanks to Peyton for the tip.