What happens to our iLevels?

[Shinun]

But do those level 50 quests give enough gear with high enough item level? Of course Squeenix could always add proper gear rewards to them for the new players who hit 50 after the expansion is out.

Their are story related dungeons which forces a player to get their ilvl up to continue on, so if they even want to advance into the expansion they have to have cleared atm the last story related dungeon is Keeper of the Lake which has an ilvl requirement of i90.