Other than just way much better and more efficient and reliable Unicode support in the most recent version, also the supported Unicode standard was followed:
Perl Unicode
release version
--------- -------
v5.8.8 4.1.0
v5.8.9 5.1.0
v5.10.0 5.0.0
v5.10.1 5.1.0
v5.12.0 5.2.0
v5.12.1 5.2.0
v5.12.2 5.2.0
v5.12.3 5.2.0
v5.12.4 5.2.0
v5.14.0 6.0.0
v5.14.1 6.0.0
Improvements in 5.14 made it virtually impossible to backport those improvements to 5.12 and older: you cannot take a single (Unicode) module from 5.14's CORE distribution and "upgrade" Unicode to 6.0.0 in 5.12.x
Enjoy, Have FUN! H.Merijn
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