There's a new development release on CPAN which has a ton of fixes and changes around UTF8 and encoding. Amongst these changes are te fact UTF8 encoding is enabled by default, which is a proposed change still subject to reversing if it turns out to be too painful.
If you never bother to test development releases of Catalyst, this is the one time you really should. I expect this dev cycle to remain elongated compared to the ones in the recent past given the depth of refactoring here.
Although the bulk of the changes are around UTF8 and encoding there's a few other tweaks, including a new dispatcher mathing rule 'Scheme' that lets you match actions based on the URL scheme (for example to require an action to be HTTPS).
If you are a CPAN author that supports bits in the extended Catalyst ecosystem I recommend testing as well.