
Are the following mentions coreferent?:
<m> unveiled </m> in New MacBook Air models officially unveiled with Ivy Bridge upgrade As rumored, new 11 - inch and 13 - inch MacBook Air models have just been officially announced by Apple at WWDC 2012. 
</s>
<m> unveils </m> in Apple unveils cheaper Ivy Bridge - powered MacBook Air June 12, 2012 Apple has chosen WWDC week to announce an update to its MacBook Air line. It may lack the Retina display of its newly upgraded, headline - grabbing cousin, the MacBook Pro, but the 2012 Air sees significant advances too. An upgrade from Sandy Bridge to Ivy Bridge processors with improved integrated graphics is chief among the upgrades, and onboard memory has also received a boost. 