Screenshots [from the open beta test of Heroes 5].

Yeah, the building menus are definitely simplified; they used to put more effort into the artwork, but now everything is more generic.

Here are some screenshots from Kohr-Ah:

http://img38.imageshack.us/my.php?image=avenge.jpg - this is how the altar works for Sylvan.
http://img38.imageshack.us/my.php?image=fourth1.jpg - level 4 of the Tower.
http://img38.imageshack.us/my.php?image=fifth6ds.jpg - level 5 of the Tower.
I don't quite understand how spells are acquired; it says there's only one level 5 spell, but 4 are shown. 2 of them were definitely learned.

http://img36.imageshack.us/my.php?image=town25pv.jpg - this is what the Castle building looks like. The semi-transparent houses show which buildings can be constructed this turn.
http://img38.imageshack.us/my.php?image=recruit3.jpg - I built dragons, but didn't use them in battle. I suspect that they also hover above the ground in battle.

http://img36.imageshack.us/my.php?image=skills26du.jpg
http://img38.imageshack.us/my.php?image=skills3.jpg
http://img38.imageshack.us/my.php?image=abils2.jpg
http://img38.imageshack.us/my.php?image=artefakts.jpg

This is what the hero looked like at the end of the game.

I'll also add the last duel screenshot to the report:

Last Duel: Kohr-Ah vs. JetJedi: [thanks to Kohr-Ah for the screenshots]

http://img41.imageshack.us/my.php?image=start3md.jpg
This is what the duel creation window looks like.

http://img41.imageshack.us/my.php?image=start23ce.jpg
The battle has begun. Cerberuses get the first turn (demons are slow). I didn't want to skip a turn, so I cast "Gating" - a yellow circle in the center of the field. The cavalry skipped their turn.

http://img41.imageshack.us/my.php?image=duel38xp.jpg
Imps move to the center, nightmares attack the swordsmen. The ballista wreaks havoc - it eliminates a quarter of the imps. Angels kill the devil, clerics cast "Bless" on the angels.

http://img4.imageshack.us/my.php?image=duel40rr.jpg
The devils start moving forward, dealing some damage to the angels. Succubi attack the cool group in the corner, the demons don't reach the angels 8(. Swordsmen and militiamen decide to protect the archers. So I cast "Fireball" on them, and they got nicely roasted 8).

http://img44.imageshack.us/my.php?image=duel59hx.jpg
Griffins return to the field - they were aiming for the pitlords, who moved one square - the griffins missed 8). Finally, cerberuses are summoned - 24 free creatures. Nightmares break through to the archers (apparently, the swordsmen ran away in fear), most of my creatures are already in the center.

http://img44.imageshack.us/my.php?image=duel69rh.jpg
The devils are cursed (ha-ha), I destroy the ballista with them - it's a terribly annoying thing, it moves often and hits hard. A piece of the succubi attack is captured.

http://img44.imageshack.us/my.php?image=duel78qj.jpg
A clear example that everyone won't fit in a small space (this is the second turn of the pitlords, their movement is equal to 3, the nasty log is in the way). By the way, another squad of imps was summoned on the battlefield. I've already crushed the archers and angels.

http://img44.imageshack.us/my.php?image=duel84ei.jpg
It's hard to get used to the third game - for some reason, I moved the pitlords, freeing up 4 cells. A griffin immediately landed there and blocked the succubi.

http://img43.imageshack.us/my.php?image=duel99mr.jpg
I decided to try out the demons' "Explosion" ability - you can guess the effect from the scorched grass under them 8)). This is essentially the end of the duel - 25 pisants remain, who quickly kicked the bucket.

P.S. Pitlords are not a name in the game; I just call them that out of habit 8).

-add-

http://img44.imageshack.us/my.php?image=duel4iy.jpg
I decided to play as Dungeon again. It was a colorful battle 8).

http://img44.imageshack.us/my.php?image=duel25or.jpg
Never repeat my mistakes - look at the attack scale more often -_-

http://img44.imageshack.us/my.php?image=duel34km.jpg
The ballista really annoys me - it killed the bloodsisters like nothing. Griffins took care of the matriarchs, received "Implosion" in the face (one was enough, the hero also had luck + hydras bit them).

http://img300.imageshack.us/my.php?image=duel51ok.jpg
I ate the archers with dragons, damaged the angels with raiders. By the way, assassins are nasty creatures - they deal little damage, but they poison, which is very annoying.

http://img300.imageshack.us/my.php?image=duel63qa.jpg
http://img300.imageshack.us/my.php?image=duel77zh.jpg
I decided to do some really scary magic. It looks effective and works effectively. Be sure to try it 8).

P.S. Dungeon has too few units... it relies on magic.
Titan screenshots:
http://img35.imageshack.us/my.php?image=battleac14ui.jpg
http://img35.imageshack.us/my.php?image=battleac46ko.jpg
http://img35.imageshack.us/my.php?image=battleac54eq.jpg
http://img35.imageshack.us/my.php?image=battleac60bm.jpg