Since March 2014 Bukkit has been converting and preparing plugins for UTF-8 compliance. With this change in place, all plugins will now load their configuration files as UTF-8, which is a supported encoding on any valid JVM implementation. This should pose no issues on any server which has run Bukkit after 2014, and the only possible breaking path is when an embedded file is of a non UTF-8 compatible encoding (which it should not be anyway).
