Apple has started sending invitations to the media for a special event scheduled on April 15 during the NAB (National Association of Broadcasters).
The invitation's title is "Lights Camera 'Apple logo'" while the teaser states "Please join us for a special presentation at NAB in The Venetian Hotel and Casino on Sunday, April 15 at 11:00 am. Seating is limited for this invitation-only event."
The NAB takes place in Las Vegas from April 14 to 18. Several companies - including Apple - developing products for professionals are gathering every year and usually announce new pro-oriented products.
Apple has already made software announcements such as new versions of FInal Cut Pro during this event. One could expect the company to release a major update to its Pro audio-video suite and maybe some hardware updates such as updated Mac Pros or/and Cinema Displays.

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wasn't this already reported
wasn't this already reported a few weeks ago?
it sounds old news to me.
This report indeed announced
This report indeed announced Apple's NAB event some weeks ago.
The real news are that Apple is now sending invites to the press.