User blog comment:Rappy 4187/Technical Update: April 13, 2016/@comment-24473195-20160413211823/@comment-24473195-20160413214731

Good to know. It is kind of obvious that most of these improvements will likely be related to the Infobox builder, as it is currently an oddity that the editor can't really create a new infobox internally unlike most other things page widgets it adds.

Speaking of which, there doesn't seem to be any "official" documentation related to the infobox builder, aside from the Europa theme. Its integration to the VE / RE or lack thereof should probably be better documented or at least initial docs would be nice.