Hello.
The kde-builder tool is ready to be switched to the new config format.
Some users already have tested that (see mr !60), and reported no issues.
Old user that have the ksb format config and do not have a new format config, will be prompted to use a converter script.
New users will have a new format in the first place at the time when they generate it.
I am giving some more time before actually making a switch.
There is also a room for proposals in case you have some.