I thought 5.10 was a very exciting thing inside and outside the community of Perl.
A new stable release shows that the language is alive and well, that it's being well-maintained, and continues to evolve: bugs are fixed and new and exciting features are being introduced. The introduction of Perl 6 ideas, both in 5.10 and in Moose is also interesting, as it allows people to gradually come to terms with some of the new stuff Perl 6 will bring.