Apple confirmed earlier today that you will be able to watch a live video stream of its Worldwide Developer Conference later today from 6PM BST, straight from San Francisco.
As expected, you will need to have Safari 4 or later on Mac OS X v10.6 or later, Safari on iOS 4.2 (iPad, iPad mini, iPod Touch or iPhone) or later or a second or third-generation Apple TV.
For some odd reasons, Apple’s press release mentioned that the keynote will be broadcasted using HTTP Live Streaming, which according to the statement is “based on open standards”. What it fails to mention though is that you will need a QuickTime plugin on browsers other than Safari.
After the keynote ends, the video footage of the event will be archived online at http://www.apple.com/apple-events/june-2013/ . ITProPortal.com will be covering the 2013 edition of Apple's Worldwide Developers Conference keynote later today, which you can follow here.