I'd like to brag a little here - I predicted this exact timing of iMac release, and no redesign, being so confident, I even said "I have spoken!" - more importantly, I have provided valid reasoning, not just pointless speculation:
If the Intel iMac is getting delayed, it's not because Apple wants to delay. Apple has every incentive to release it as soon as is humanly possible. Why? A very simple but extremely compelling reason - they need as much time to elapse between the last release of an Intel iMac and an AS iMac...
forums.macrumors.com
(1)A lame Intel iMac is coming out very soon - early August, maybe even next week
Oh, and like I argued from day one - THERE WILL BE NO RE-DESIGN OF THE INTEL iMAC!!!
I have spoken!