Follow the video here and download the template here.

Most of this was copied from Joan's Texplus Plugin guide. Please read below thoroughly.
There are similarities with the old format. Still, there are new things:

- customAlphaMask (optional): if specified, said texture will be used instead of the Albedo's alpha channel. 

- linear (optional): if specified, forces the texture to be read as linear or gamma. Valid values are "true" and "false". If you ignore this setting, PNG textures will be considered linear and DDS textures will be considered gamma.

Finally, here is the complete list of valid texture names in the new format:

- bodyTex

- bodyTexN

- bodyTexS

- bodyTexOM

- faceTex

- faceTexN

- faceTexS

- faceTexOM

- irisTexL

- irisTexR

- eyeWhiteTexL

- eyeWhiteTexR

- tongueTex

- teethTex

The Guide Video. Also Download for the template guide here.