Currently the only formatter available in EAP 6 is the "pattern-formatter". This feature will allow customers to create their own custom formatter and use it in any handler via the CLI and/or jboss config XML.
This will unfortunately not make it into EAP 6.2 due to time constraints and a rather significant change to the management model.
Verified on EAP 6.3.0.DR2.
Added draft release notes text.