This rings a bitter note for me -- I bought a Galaxy Nexus a while after it came out and I was really surprised how quickly Google discontinued updates for it. Is it expected that "the next five billion" will also buy a new phone every two years?
To quote Google:
> Galaxy Nexus, which first launched two years ago, falls outside of the 18-month update window when Google and others traditionally update devices.
(I still own the phone and I have the latest Android because of Cyanogenmod, but again, this is not something that can be recommended to "the next five billion".)