According to KGI Securities analyst Ming-Chi Kuo " Apple plans to debut a 12-inch MacBook Air model with a Retina display. Despite all the power those new pixels will draw, the Retina Air will not have a fan. It will also somehow be even thinner than current models and will include a new trackpad design with no button."
Details surrounding the new addition to the iMac family are more scarce, likely because there simply isn’t much to report. Kuo says " the new model will be cheaper than current models in an effort to gain share against low-cost all-in-one models from HP and Lenovo."
Apple’s new entry-level iMac is expected to debut in the second quarter this year, and Kuo says the MacBook Air with Retina display will launch late in the third quarter or early in the fourth quarter.
MACRUMORS