As rumoured just a few weeks ago, Apple has officially sent out invitations to select members of the media. The invite is for a special event to be held at NAB on the 15th April 2007.
The invite can be found online where it looks like anyone can register their interest for the event.
The invite reads:
Please join us for a special presentation at NAB in The Venetian Hotel and Casino on Sunday, April 15, at 11:00 a.m. Seating is limited for this invitation-only event.