I will be watching it on my Mac, the iPhone 6 will be announced thats almost certain, but i think there is more speculation over a 4.7" and a 5.5". I'm not sure if other products will be announced, updated Mac's maybe? The iPad is likely to get its own event in October. I'm looking forward to see what announce in September
Apple has been very inconsistent with streaming their events.
WWDC 2014 - Streamed
iPad Oct 2013 Event - Streamed
iPhone Sept 2013 Event - NOT Streamed
WWDC 2013 - Streamed
iPad Oct 2012 Event - Streamed
iPhone Sept 2012 Event - NOT Streamed
iPad March 2012 Event - NOT Streamed
iPhone Oct 2011 Event - NOT Streamed
iPhone June 2010 Event - NOT Streamed
And every iPhone event before it... NOT STREAMED. I am going to make another declaration. The iPhone 2014 event WILL NOT be streamed.