With the new facial recognition feature in Lightroom what information is preserved in the meta data of the image once it is exported !and is it readably by search engines such as google. I.e. is it just the keyword saved in the meta data or is it the keyword and the face location in the photo?
Lightroom would save the person info in the standard keywords, IPTC Person Shown, and Metadata Working Group image regions format Metadata Working Group: Specifications. The later also describes the face location. Apple's iOS devices and some camera vendors have adopted the same MWG standard for describing face regions.
BTW, Lightroom can also import face regions image metadata described in Metadata Working Group: Specifications XMP, embedded by image capture device or external applications.