Are there any plans to make a sixth installment in the Heroes series?

I don't know. The graphics aren't great, but it's not a shooter, it's a strategy game. And as for the "cartoonish" style, wouldn't it be boring if everything was in gray tones? No, this style suits the game perfectly (in my opinion).

Well, I wouldn't say so. The upcoming Disciples 3 promises to be in gray tones. I've seen the screenshots, and I personally like it. And even if you take the game "Dark Messiah" and compare the zombies from it with the zombies from the 5th installment... Okay, let's not start an old conversation, especially since it's off-topic. But I still hope that the 6th installment will have darker tones and truly impressive demons, undead, and evil and ugly orcs, like in Tolkien's works. And I hope that the 6th installment will be rated at least 16+. Because of the creatures and some brutality.