Thinking a little more about having a mouse-over summary like the suggestion above, it would also be good to indicate the number of retaliation strikes a unit has and how many it has used. I didn't bother mocking one of these up at this stage.

Also, if a unit has a special attack that should be shown as well.

And archers would not show the defender 'To hit' or 'Damage' unless they were capable of some sort of retaliation strike.

Area effect magic could just show the info for the unit under the cursor - it would get messy having all the squares active with the status boxes.

 You think magic is overpowered ? I think not , an army consisting of archers  and even better catapults can sometimes one shot a sovereign and its very unlikely hes able to cast anything at all. Its getting better , yes but theres still a huge balancing effort to do. The defense stats is oversimplified, units should have specific strenghs and weaknesses.

      I think catapults should not be able to hit a sovereign, they should be able to hit infantry , get a bonus when attacking units garnisoned in cities, but not be able to crush everything at will. Medieval armies were using them for sieges.

Cavalry should be devastating against archers and catapults , high defense versus arrows and projectiles, but weak against infantry equiped with long spears.

 Sovereign and champions should have higher evade skills, and should start to take heavy damage only   by  strong monsters , strong units with good equipments, and off course other sovereigns and champions.Right now they  are decimated by a single volley of arrows or a basic infantry.

    Spells must be more specific and specialized, i still see no reason to use most of them. Now the fact the shards are rare and give big bonus force specialization and thats a good thing. You choose your spells according to range and now according to your best shards, but now we must have spells availabe only if you own a shard as well, much bigger buffs, rituals taking mutiple turns to cast , consuming ressources,and immobilizing the sovereign. Take MOM as example. Right now its worth researching the nukes according the shards you own, a teleport spell, maybe lower moutain .

 Well at least we are getting there i hope, game is much more smooth, stable, and IA more reactive now.

I love your battle expected odds tooltip. Civilization V has implemented something similiar (but not nearly as nice looking as yours:) and it makes a TBS a lot more playable. It is hard to keep track of all of the various abilities and effects that modify the to-hit and damage chances.

To be honest, When i played 1.07 (haven't played 1.08 yet), I felt magic was very underpowered. Most of the spells would barely do any damage and I had finite (very finite) supply of ammo (mana) where as archers and catapults can fire all day to full effect. Either mana needs to be regenerated at some rate in combat and/or a higher minimum damage (not maximum, i did have a few hit for 50 damage on AOE spells) so that each usage of mana feels worth it.

Nice suggestion ... your lower pic (the one with the Battle Odds calculator) speaks volumes. In both UI and combat mechanics.

If the UI was more informative (like your pic), then at least people would know what to expect .... is Hit% and Damage currently separate??

i agree, i love the tool tip like approach.  we need this badly.