This post will be updated when more info comes out.
Before patch 7.2, you can upgrade your Class Order Hall followers to ilvl 850.
When 7.2 comes out, you can upgrade them to ilvl 900.
Now, most important thing here, is that you cannot upgrade your followers with the ilvl upgrades you have pre 7.2 Those works only to ilvl 850.
If you want to upgrade above 850, there will comes out new ilvl uprages when 7.2 is live, and it will only work with those items.
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