I hate to be so negative without offering a suggestion, so here's my advice. Hark, and take heed! Or something. Also, lo.
Step 1:
List your features.
Step 2:
Make each feature AWESOME and integrated into the whole.
Step 3:
If you can't do that, or you don't have time to do it, cut the feature.
My attempt at the above:
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Features:
1) Sov/Champion leveling. Awesome. Done.
2) City buildings. Pretty awesome. I'd mark as done. Some balance tweaks. Some buildings feel out of place.
3) Spells. Just needs some small balance work to be awesome. The hard work here is done.
4) Tactical Combat. I think this needs a *lot* of work. This should have been a whole beta phase, it's so core to the playing of the game. This is somewhat tied to spells. Use the gaps in spells to add tactical spells. Not damage dealers. Not percentile spells. AoEs stuns. Walls. etc.
5) Monsters. Also, making monster combat interesting. Giving monsters good abilities. Example: Mites. Might as well be fighting rats. Make them blink. Or split when you hit them into two. Every monster should be interesting in some way.
6) City leveling. On the right track, but feels like it could use more city levels, really. Or maybe I'm just not able to get them. It's so much work to actually get the grain to level up your cities. I'm not sure I've ever even gotten to a level 3 city in the last couple of builds. Compare the difference between a Civ 5 1 pop city and a pop 30 city. :-/ I don't expect thirty levels, but some range of strength would be nice. Even just a: "Hey would you like to add a grain, material, essence at this new level?"
7) Unit design. Awesome. Done.
8) Outposts. Not awesome, and no real plan to get there. Cut it. Outposts provide territory to get resources.
9) Resources. Oh, resources. I look back on resources and wonder if it was all just a bad idea to begin with sometimes. Maybe it would have been better to go the civ model. Probably too late to change that now.
10) Tech tree. Debate-able. Man, I hate the magic tree. I *hate* the magic tree. Civ tree is fun. I wish spell levels for sovereigns/champions were linked to the MAGIC TREE. How sensical would that be? And not to level ups. It'd give me a reason to research the dang thing.
11) Quests. ... Guys, I know you've put a lot of effort into it. But quests are not fun. I've wanted them to be fun. I know it's all extensible. And great. No, here's what it is. Go to A. Then, go to B. Fight something. I'm sure they could be made fun with a lot of effort. But currently not awesome. Cut it. Especially the noblewoman quest. Cut that twice.
12) Equipment/Loot. Sounds like you're tweaking this in the next release. Yay!
13) Diplomacy. Seems pretty good from what I've seen. Honestly, it takes a loooong time before I even wind up dealing with other civs. Maybe too long.
14) AI. Haven't played enough to determine this.