An Android version doesn't exist because there are strict hardware requirements and capabilities that devices must have before they can license the Android Mark

An Android version doesn't exist because there are strict hardware requirements and capabilities that devices must have before they can license the Android Marketplace. Right now this requires phone, internet access, and etc. Google is rumored to relax these restrictions in the upcoming releases so tablets and other devices can use Android and also be able to license the Android Marketplace at the same time. This is when you will see the Google sanctioned Android be on more devices.