There seem to be some issues with the baseline ilvls awarded from some of the quests in the pre-release events.
In Alpha all of the scenarios awarded 700 gear if i remember correctly.
However, at the end of the day these are just intended as
a) lore and hype bombs
b) transmog gear
c) catch-up mechanic for returning players so they don't have to enter Legion with 630 gear.
The gear itself will be irrelevant almost instantly upon Legion release, so the actual ilvl is more or less unimportant.
I mean, did people really expect to get upgrades from this while wearing HFC HC or Mythic gear?