Board Thread:New Features/@comment-5558012-20151119135048/@comment-24473195-20151120161826

There is a brief explanation of it in a recent office hours thread (see w:c:portability:Thread:2990.

Anyway, the short and simple explanation is that this is  one way to understand what templates people use,  and to better design tools to facilitate their use.

It is also helping the drive towards structured data.