Heiya,
this list was not really active in the past months, however you may use it too. :) During the past half year the main entry point were GitHub [0] and Phabriacator [1] but a list probably allows for better discussion.
Cheers Karsten
[0] https://github.com/WikiApiary/WikiApiary [1] https://phabricator.wikimedia.org/project/view/2341/
wikiapiary@lists.wikimedia.org