The minimum requirements for Android 2.3 Gingerbread are
MUST have at least 128MB of memory available to the kernel and userspace. The 128MB MUST be in addition to any memory
dedicated to hardware components such as radio, memory, and so on that is not under the kernel's control.
Device implementations MUST have at least 150MB of non-volatile storage available for user data. That is, the /data partition MUST be at least
150MB
SHOULD have at least 1GB of non-volatile storage available for user data
there is no CPU/GPU minimum requirements
http://static.googleusercontent.com/external_content/untrusted_dlcp/source.android.com/en/us/compati...
I wish I could copy paste the OFFICIAL reason by SE but for some misterious reason those posts are gone, like this
http://blogs.sonyericsson.com/products/2011/03/25/update-on-xperia%E2%84%A2-x10/
I think Xperia Users deserve a better reason on to why their phones aren't receiving any future updates and NO it's not due to hardware limitations
