Apple announced on Tuesday that it will stream the keynote event from the company's annual World Wide Developer Conference (WWDC) on June 2nd. In the announcement, Apple went so far as to say it would have "exciting announcements." The event takes place in San Francisco at Moscone West, starting at 10:00 AM PDT/1:00 PM EDT.
Posted to the Events Page at Apple's Website
Apple hasn't streamed many of its keynote events as they happened, though some of them have been made available after the fact, as shown on the Apple Events site.
Apple is expected to unveil iOS 8 and OS X 10.10, and the company might introduce software initiatives such as the rumored "Healthbook" app in iOS. That app is likely tied to the even-more-rumored iWatch, but Apple is not expected to unveil that device at WWDC.
When combined with the fact that Apple is promoting this event to the public, the bold claim that it would have "exciting announcements" makes it seem quite likely that Apple will unveil additional products or services for consumers at this keynote.
To wit, there was a report over the holiday weekend that Apple would be launching a new platform for home automation at WWDC. That's the sort of thing that would warrant a live streamed keynote.