
Are the following mentions coreferent?:
<m> announced </m> in Apple's big announcement at Macworld yesterday was not a new iMac, Mini or netbook, all of which had been rumoured, but a battery. The firm announced a widely expected refresh of its 17in MacBook Pro, with a battery that the firm said will offer eight hours of operation. 
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<m> announcement </m> in Today may be Apple's last Macworld Expo appearance but Apple came bearing gifts. Apple's first hardware announcement at Macworld today introduced the 17 '' MacBook Pro. Built on the precision unibody enclosure, the Pro was launched as the world's thinnest 17 '' notebook, at only 0.98 inches thick, and also the world's lightest, weighing in at 6.6 pounds. 