There are a few things we cannot do before jessie has become the next Debian stable.
This ticket will function as a blocker in meanwhile.
"Maybe" means, when when Whonix 10 tasks are done, i.e. when Whonix 10 is ready for release, but jessie has not become Debian stable at that point, then Whonix 10 would be released using jessie. One of @Patrick's goals for Whonix 10 is being ready for jessie, i.e. have Whonix 10 being capable of being upgraded to jessie.