Mystic Phoenix posted in our forums the highlights of a preview in a German gaming magazine. Here are some of the most interesting tidbits:

• "there will be a completely new designed world in Heroes V, thus known heroes won't appear.
  
• Confirmed factions: humans, demons, undead
  
• heroes don't act on the battlefield, but wil cast spells
  
• the storyline begins as follows: The demons kill the recently crowned king of the humans, Nicolai, whose wife Isabel seeks revenge. To defeat the demons, she makes an alliance with the undead followers of the necropolis - a fatal decision...

There is also a small scan of a screenshot included in the article which has been added to the screenshots page.