Warner Bros. has officially announced that the trailer for Harry Potter and the Half-Blood Prince will debut via satellite feed on Tuesday, July 29 from 9-9:15 p.m. and re-air on Wednesday, July 30 from 6-6:15 a.m. (both EST).
Here's the information if you have the equipment to pick up the feed:
Galaxy 28, Transponder 19, C-Band Analog
Downlink Frequency: 4080V
Audio Configuration: 6.2/6.8
For those of us without the equipment, it's likely to appear before The Mummy 3 or whatever movie that is which'll be in theaters the next day.
I'm sure it will make an appearance online at some point shortly after that.
HBP will be in theaters November 21, 2008.