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Thanks! This is useful for us, too.
I’ll provide some informal thoughts below - hope you don’t mind my off-the-cuff feedback.
We have ambitious plans for Last Epoch’s post-release support. While we’ll definitely want the campaign to feel like a story which has a beginning, a middle, and an end, I would add that we are likely to continue to explore the lore behind the game after launch.
Except for the Illusory Tree triggered by Arboreal Circuit to avoid treeception. 
There has been some discussion internally regarding this.
Legendary items were envisaged as being particularly powerful, rare and distinctive items which are broadly comparable to unique items. Historically one of the most common responses to this has been the question of whether this warrants an entirely separate rarity.
While we’ve no plans to remove the distinction entirely, we’re open to changing how we go about implementing that distinction. To offer an example, Diablo III has Legendary Items and Ancient Legendary Items. It’s possible we would go from the idea of having Legendary Items to having Legendary Unique Items, or otherwise making a sub-rarity rather than a wholly new rarity. Since I’m posting about this, we’d certainly welcome feedback on this.
(I’m only referring to Diablo III’s naming conventions. We do not have any intention of having our Legendary Items mirror the functionality of Ancient Legendary Items in Diablo III.)
Could you clarify the first part of this?
Please note that is something for which there will be a degree of secrecy. We’re unlikely to publicly discuss exactly how we detect cheating, as doing so tends to result in prompt updates to botting software to help them evade the specified detection methodology.
tl;dr: There’ll be anti-cheat. There may not be announcements surrounding it, however.
I’m not sure if we’ve publicly referred to them previously, but you can add Staves to the bullet point mentioning Foci, Daggers, and Bows. I’ve even designed a unique staff. 
Also, you could add a new Increased Zone Persistence bullet point or something to that effect which would refer to zones not immediately resetting upon your departure.
I’d be inclined to caution against such an expectation. Months of proactive balancing prior to the implementation of PvP is unlikely to be feasible, and the goal of balance being perfect prior to implementation is not one we would attempt to pursue.