I've got and played every Heroes game since the original Kings Bounty and from what I've seen of this one so far I'm not exactly excited about it's upcoming release.
I think KB:TL and KB:AP has raised my expectations of what a game should be and I dont want anything less. I doubt H6 will live up to my expectations.
I will buy it however as I always buy games with Might and Magic in the title, it's the law. I just hope I can finish it before a new KB appears (wishful thinking) because it wont see the light of day otherwise.