According to AppleInsider, Apple could be about to release speed-bumped iMacs this month. Online Apple Stores are now showing ship delays of 7 to 10 days across the iMac line which is usual with Apple when a line of products is EOL'd.

A speed-bump to 2Ghz (probably for the high-end model) is suggested while sources informed AppleInsider that Apple will make an announcement as soon as on next Wednesday.