Next Harry Potter Book NOT to be written by J. K. Rowling

This teaser trailer is going the rounds at the Harry Potter fansites and causing a lot of consternation. The companion website (www.elderscrossing.com) shows a very professional (i.e. NOT fan-made) teaser trailer for a new book called "James Potter and the Hall of Elders' Crossing"-- sounds great, except it DOESN'T seem to be affiliated with J. K. Rowling! Or is it? The question: would YOU read a Harry Potter book 8 NOT written (but apparently endoresed by) J. K. Rowling?