I have no idea what Summit has planned for
Before I tell you the date and time that the trailer is supposed to premiere on the internet, lets first say happy belated birthday to Justin Chon, who turned 28 the other day (read here). Then let me remind you that my source is normally accurate, but I have heard no official word on this date and time myself.
horrormovies.ca says the studio sent them an e-mail saying that the New Moon trailer will debut online May 31 at 7:45 pm PT/10:45 pm ET. So make sure and check back with HYB’s Twilight blog around that time to find out how you can watch the trailer."