If true this Apple event on October 23rd could be packed with lots of goodies.
This from 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.
Also in line with previous rumors, the report suggests that Apple may first update the 21.5-inch model with the new design, which is said to maintain the existing "chin" below the display even as the body is tweaked with a thinner profile. The updated 27-inch model could then follow somewhat later, as has been suggested due to the challenges of laminating the larger display and glass with acceptable yields. The new iMacs are also said to be more expensive than the current models, but it is unclear how significant any pricing changes would be."
the iMac is long overdue for an update, it`s been over 500 days since the last one, no word on specific pricing and CPU/GPU options but the sooner the better