It seems as if my prediction was accurate. The new “Spectral Bear” model is in fact the next Spirit Beast and will be introduced in Patch 3.3.
“Arcturis” is a neutral level 74 Elite Spirit Beast that can be found on the Patch 3.3 PTR in Grizzly Hills.
So far the only known spawn location is just north of Amberpine Lodge.
Head over to Mania’s site to view the original post from the Hunter who first discovered this new Spirit Beast on the PTR.