Ok, so i've put a bunch of hours into 3B so far today. here are my thoughts so far.... (and sorry Stardock, ive been having fun!!! 
BUGS:
Crash to desktop with caravans enering cities (especially foreign cities)
Have to make a spell a 'favorite' in order to use it in combat. unable to make 'hurl boulder' a favorite at all
animation issues with Gilden (my guys had inverted torsos)
NO BABIES!!!!! For some reason, my married couples arent popping any babies out!
Goody huts not disappearing
When attacking a city, goes into automatic 'autoresolve'. Don't get to fight in the city 
Tactical Battles: So far, AWESOME and a LOT of fun. areas of improvement:
PLEASE uncouple movement and attacks, and have one stat for movement over tiles, and one stat for number of attacks.that way we can design infantry units (like beserkers) that although arent as fast as cavalry, get lots of attacks once they get in close. Also, this will help 'uncripple' units with plate. Its frusturating having a unit that cannot move at all.
I saw frogboy mentioning theyll put counterattacks in: looking forward to that mechanic. also looking forward to special abilities.
Bows seem overpowered currently, as does combat speed (hit and run with combat speed, bows do massive damage)
pre-combat placement, ala HOMM 5. Could be a skill relating to 'warrior'/general heroes. This would allow better use of the overall battlefield, as of now units start too close together AND give a dynamic for 'ambushes'
ADVENTURING/HEROES: A LOT more fun this time around, i love the variations in quests! areas of improvement:
WAYYYY too many goody hut spawns. although a neat mechanic, these good huts prevent you from being able to build a city in their tile OR roads through the tile. This is frusturating, and i find myself not progressing down the adventure tree as fast due to wanting to plop down my cities first (and forgo all those great quest rewards). continue the spawn, but not nearly as many....maybe limit the spawn to a player's territory and slighlty outside.
Please make some fallen heroes for the fallen races. Its wierd having all-human heroes running around with hordes of fallen....who hate humans...at their back. Could be a mechanic were theres a 'friendliness' factor of NPCs along racial/moral lines. This way, 'evil' fallen and human NPCs are more likely to join empires and ATTACK kingdoms, and vice versa.
City Building: Kicka*&! I love the new changes. No suggestions.
Tech Tree: ditto. like teh varying tech trees, looking forward to more.
Dynasty:
As above. Doesnt seem to be working.
More 'genetic algorithm' with marriages- past games had gimpy, wussy kids even though my warrior soverign married a tough adventurer.
AI:
Does a LOT better. Good job! Its designing better units, building better cities.
-still doesnt defend cities well. General C built a city, walked outside, and it got burnt down, gimping him at the beginning of the game.
-AI will build starting cities not near a food source, gimping iself
Other suggestions...
SPELLS TO CREATE ARTIFACTS! please?
All in all, AWESOME!!! game is shaping up nicely.