As far as I understand Enjin becomes a Unity Asset Store partner which to be honest doesn't seem to be that big of a deal. It just means Enjin puts some assets in their store. But it's nice they'll probably get a spot on the partners page, next to Microsoft, Vuforia and Samsung.
What bugs me the most is the fact that Unity has not released any info concerning this partnership.
And staff at Unity have not heard about this news as my post on their forum has been considered as speculation and removed by Unity staff.
On top of that, I get banned from the Enjin telegram channel for asking questions on this subject.
Let's hope that some clarity comes along.