Apple may refresh the iMac line next week with faster machines, but there's still no Retina Display to be seen.

A spec list has leaked on French tech site Mac Generation which shows the speed bumps. The source of the site recently correctly predicted the last MacBook Pro upgrades, so we're inclined to believe this rumour.

The new iMacs should come with faster CPUs, specifically Intel Haswell processors which should run about 100MHz faster.

The rumours hold even more weight when recent Mavericks beta OS code is taken into account which refers to two iMacs not heard of before, "iMac15,1" and "iMac15,n". The current generation us "14,1" suggesting this will be a new line altogether.

Predictions from analyst Ming-Chi Kuo also suggest that there will be a more affordable iMac on sale soon too.

Unfortunately in all this leaking there has been no mention of a Retina Display. It's hard to imagine Apple sticking with its now low resolution screens in the face of advancing pixel counts on everything from mobiles to tablets. Here's hoping Apple has just managed to keep this one a secret.

READ: Apple iMac 27-inch (2013) review