Update on this, upon further investigating it appears that the Auspicious Arborwyrm mount might be in BOTH Retail and Classic and that "
unknown mount A" (the mount using elemental/wind assets)
might be the Auspicious Arborwyrm, which fits with the theme of the assets.
It also implies the Fyrn pet (retail) that shares assets with Unknown Mount A is related to it somehow and by extension probably the Cypress pet (classic) as well. Maybe we're getting expanded Lunar New Year rewards for both Retail and Classic?