Good list, seems like it covers a lot ... except for one thing ... A BETTER MAGIC SYSTEM!
I know that this has been mentioned a LOT (and I mean a lot) on the forums, but seeing as how your list doesn't specifically state anything about the magic system (I know you said it's not exhaustive, but this is important), I thought I'd reiterate. The magic system (spells, tactical magic, overland magic, more spell focus in general) needs a major uplift, if not complete overhaul. As I've mentioned a few other times, the thing that makes the game not quite fun to play (and sometimes downright boring, to be honest) is the fact that this is not a fantasy strategy game right now, it's just a strategy game. The game needs more spells, many more. You have a list of about 300 spells that were submitted and that you own now, put the best 100 in there. After that, add 200 more, just make sure the game has diversified spells. I want to be able to have a choice of many tactical spells when in a fight, and I want to have many overland spells (and not just the "raise land," "lower land," etc). Remember, it's ok to use the generic fantasy stuff that people are used to in other games, that doesn't make it look cheap. You can have your unique style of things and still have some "old-fashioned" magic and spells.
I know it's like beating a dead horse mentioning this again and again, but please give us an overview of what you plan on doing to the magic system. THIS, in my opinion, it's good implementation, and the AI's ability to use it well, are more important than everything on your list. It's what made MoM, HoMM, AoW:SM, etc. fun: a good fantasy magic system.
EDIT: I just want to add that I'm not trying to be offensive. I know you have put a lot into this, but as your claim states you want this to be THE premiere fantasy strategy game, just as I want it to be, I'm giving my opinion on what you need to accomplish it. In no way am I saying you don't need to focus on the list you have, but I believe that a stronger magic system is more important right now. The game is very stable right now, so let's make it more fun.
REALLY agree with this. MoM had about 50 spells per area, somewhere around 250 spells total to my memory, and it's O L D. It enabled flight and experience and illusions and so many other aspects that made the tactical interesting.
Elemental currently feels like a strategy game that added Magical effects, rather than a magical world that adds strategy. It seems like the Tech research has received more attention than the Magical spells and effects and counters and the WONDER of magic. Frogboy stated one time he would like to see something like the feel of 'Airbender' in the magic, a give and take, a flow back and forth of magic. Well, unless someone acknowledges the need for a major change in the magic, it seems hard to see how that would happen.
Look at it this way: many many current posts about strategy talk about using the Fire Arrow spell (can't remember name) and eventually Spell Blast and Teleport and Summoning, and that's pretty much it for spells. This should make my point--nearly every game, these are what people turn to because there are only few creative alternatives!!!!
PLEASE...Stardock...just reconsider how fundamental this is. I would have put it first on the list. Respectfully, Brad's list looks at the game from a developer's perspective. I humbly suggest it's time to look at this game from the GAMER's perspective---imbue some magic and some wonder into this game NOW. We asked for this in the self-admitted Beta that crashed and burned, and didn't get it. Will history repeat? Put GAMERS first.
Honestly, the visual elements of this game and camera angles make the graphics great, but Elemental isn't anywhere close to the fun of MoM, because it's a strategy game with some magic, not a strategy game about magic. I haven't played a lot lately because it just isn't a game about magic, it's more a game about battle. Somehow MoM made it both, and is still a superior game for providing fun.
Before I get flamed, I've been supporting SD for their efforts to build a great FANTASY strategy game for a long time. I still want Elemental to improve to be better than MoM, but for that to happen, IMHO, a significant change in the attention given to magic is required.