9to5Mac is reporting that there will be new hardware at WWDC and the most likely is the Retina Macbook Air
http://9to5mac.com/2014/05/21/apple-confirms-wwdc-2014-keynote-to-be-held-monday-june-2nd-at-10-am/
http://9to5mac.com/2014/05/21/apple-confirms-wwdc-2014-keynote-to-be-held-monday-june-2nd-at-10-am/