We've received a news tip this morning that the eagerly anticipated Half-Blood Prince trailer will debut in front of the movie Get Smart, which opens June 20th, 2008.
It should be noted that while nothing has been confirmed, Get Smart is a Warner Bros. production.
Thanks to Amit for the tip!
Update: Thanks to Katy for writing in and letting us know that the trailer was not attached to 'Get Smart'. Sorry folks!