humans:
I agree with those that say human is little weak. I know +10% pop is pretty good bonus, but just comparing them to faeries who also have tree of gold they don't seem like that strong of attacker. 5/5 is pretty gimp when you can say faery can produce a 8 defense elite and 3 offensive spec=11 and best human can do is 10. I know faeries have -10% pop bonus, but they have modded wpa/tpa(compensates with pop bonus needing less thieves/wziards to achive the same wpa/tpa) numbers in addition to +30% ops damage. It will be very hard for human to achieve in my view a very strong province that is hybrid when it seems even compared to faery it seems blah which is bad considering faeries are not an attacking race! i know Turtles have a certain advantage above static defenses but still they are quite weak when it comes to other races in the role of hybrid. Perhaps something unique like stables hold 50% more horses making horses and option worthwhile in this game, or just taking them down to +5% pop and making there elite 6/5, or just giving them straight +10% science effect or something might go a long way to just sure them up. This is my opinion of course, but i just feel the +50% damage is powerful but not if you just cant produce the numbers to make it a successful hybrid. +50% damage just doesnt help much if you fail your ops :)
avians:
Maybe slightly weak. Perhaps just small boost. I like the idea of making them less ambush-able but with their lower attack gains I don't see it as that strong of a boost. I was thinking perhaps more along the lines of giving them Invisibility spell might help some to go along with thief op bonus and perhaps 10% reduction in cost of thieves.
Sage:
-5% science cost or small amount of books per acre. Just a little to add something to this. Very hard to make sciences alot strong without any help in adding books, tho I suppose if you in kingdom that wins wars you can be strong sage, but it requires kingdom winning wars or not warring..poor chaps who war and loss as sage are most penalized personality in game. Perhaps something intresting like sage even in loss war "learns from thier" losses and gains 20bpa across the board. Couldnt be very strong or this would be abused I suppose.
I like everything else pretty much and the direction things are going, mechanics and racial changes. I always feel that to make the game more interesting you should always make races more unique with more bonus and do a few as possible negatives to each race. For example balance the races by giving them all buffs that balance out instead of alot of penalties that balance out and that's how I see the direction is going more, so good job. I know sometimes if just becomes necessary for there to be negatives to balance, but make it last case scenario.( ie:like dwarfs not being able to accelerate construct, this makes sense as not to overpower their ability to free building) Since it is fairly radical changes hard to put a exact balance on the numbers in my mind.
Disclaimer:(lol)My opinion is posted here and I know people will disagree :) but it just writing how I look at races and whether I would choose to play that race/person or not and why. Cheers~