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Besides "July"? No, nothing officially. OP has a reasonable guess, though the 25th is as/more likely as the 24th, and you can't rule out the 31st.

oh so the July is a definite. Yeah the chances seems very probable. i really hope they pull through and release a new updated one.
 
Everyone has their own opinion as to when the new iMac's will be released. They are all just guesses based on fact, fiction, and or hope. The only consensus seems to be the sooner the better.
 
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