This is a completely unconfirmed story, however there is a YouTube video out today claiming to be Android running on an Armadillo-500.

The Armadillo-500 is a new ARM11 CPU (Freescale i.MX31L) running at 400MHz. It has been released as a dev kit and has recently gained Linux driver support, however I could not see that it was present in any commercial devices at this time.

Source: Android Running In a Real Device [mobilemediaconsult.com]