Ok, I have now managed to play some hours with the demo.

First of all, there isnt much new stuff. I had no trouble what so ever navigating the interface, building recruiting etc. (Blame that on my prior experience with the game).

The only thing that can be credited as completely new, imo, is the 3d gfx. Which isnt a good idea - I dont hate it, but I would be finde with the 2d map of hmm3.

I understand why the campaign can seem difficult for new players. The trick is logistics, only go for one army. When your hero is out questing/hunting for treasures be sure to keep a line of other heros (just lvl 1) in a chain. So when your castle is threathned you can quickly supply the defending hero with troops.

the gameplay seems okay, but the demo is crap, i had bugs, objectives that didnt come etc etc, but I liked the game. I never played other hmm in campaign mode, always free play or multi play - and Im looking forward to trying the campaign. And I do hope in free play mode that the pc is smarter than in the demo.

Got any specific questions please ask them, since it's kind of hard thinking it all up.