Tim Cook has stated that Apple will have a "very busy fall" hinting at new and upgraded products. I think later this year we should expect to see new iMac models with the same form factors and display resolutions as the 2012 iMacs. These iMacs will include Haswell processors and 802.11 ac wireless.
I don't see the rumored "retina iMacs" coming out until at least 2014 with the introduction of Intel's 5th gen core processors and thunderbolt 2.
I don't see the rumored "retina iMacs" coming out until at least 2014 with the introduction of Intel's 5th gen core processors and thunderbolt 2.