Review the Release Notes of the different versions of Aspire 5 here.
Release Notes - Aspire 5.0
Release Notes - Aspire 5.0.1
Release Notes - Aspire 5.0.2
Release Notes - Aspire 5.0.3
Release Notes - Aspire 5.0.4
Release Notes - Aspire 5.1
Release Notes - Aspire 5.1.1