A little bit of advice, if I may. Now that this kickstarter seems to be a resounding success, you should focus your development efforts on Highborn Elves, even to the exclusion of everything else.
Thing is, over and over again I've seen a company produce good models that I could consider using, only that they've only made one or a few releases of a particular kind. Meaning there's no way for me to use those models even if I wanted to, since I can't get models for the rest of the army that match stylistically.
You should have a long-term goal of making it possible for a buyer to get every single entry in the Highborn Elven armybook from you. The fact that a player can do so would boost sales of ALL your Highborn Elven miniatures. Thus, even if a single product may not sell particularly well (for example, great eagles), it would still be worth having it just to provide the customer with the entire service and indirectly make money on it by boosting the sales of everything else. It's the same logic that supermarkets follow - many of the items they stock make them little to no profit, but having a good selection of products attracts customers, allowing them to profit from their biggest-selling core products.
As your next thing, I would suggest an Elven Knights boxed set. Highborn Lancers are one thing that's currently neither covered by your selection or by GW's. You could make the sprue versatile enough that they could be built as Knights of Ryma instead, that'd probably just require some dragon-themed decorations and maybe a few different armour bitz.
Alternatively, a chariot box might be worthwhile. There you'd compete against GW's chariot box, but there might be an upcoming spike in demand for Reaver Chariots now that T9A 2.0 will allow them to be fielded in units of several chariots.