News reports from last year say that Elder Wilson suggested a "traditional" theme for the 2018 Annual Council in Battle Creek, as a way of honoring Adventist pioneers. The suggestion includes beards for men.
A current picture in the online Review shows Elder Wilson giving a sermon on June 16, and he appears to be wearing a beard.
I'm not aware of any deeper spiritual significance.
However, if you wish to look into the connection between hair and spirituality, then I would suggest starting with the Nazarite angle (Numbers 6:5).