Despite being overshadowed by the MacBook and other mobile devices, Apple’s venerable iMac accounts for nearly a third of the 14.5 million all-in-one desktop computers sold in 2010. The strength of iMac demand put Apple ahead of Lenovo and HP, expecting to unveil two new desktop computers at next week’s Consumer Electronics Show.

Although Cupertino never tips its hand ahead of time, past experience indicates you can set your watch (at least by the month) for their product refreshes, so no shock here: it’s now being reported that Apple will launch new MacBook Pros in the first half of 2011, which probably equates to a April 2011 timescale, along with new iMacs, which were last updated back in January.