Eric Slivka at MacRumors:
The redesigned iMac is said to be considerably thinner than the current form factor, with the machine’s thickness almost impossible to gauge when viewed from the side. The curved rear shell is also said to appear more like a water droplet than the squared-off design seen in the current model.
The report also claims that the new iMac’s screen is glued to the front glass of the machine, in line with previous rumors stating that Apple is moving to fully laminate the two components together for improved display quality.
While the rumor doesn’t say anything about the iMac going Retina, I totally called that a re-worked design of the LCD and glass was inevitable.