Will there be a new version of Heroes 3?

Apparently, there's a misunderstanding about what WoG is. The thing is, WoG is the very engine that allows you to bring the ideas listed here to life, among other things. In the standard Heroes engine, you can only do what the developers have provided. In the WoG engine, you can do practically anything you want. Here you have graphics, new monsters, new towns, a new balance, if you wish – in short, everything. The WoG developers were able to modify the Heroes executable in such a way that fans of the game gained the ability to use both the potential inherent in the standard executable (the space left by the Heroes developers for new monsters, for example) and to introduce new elements outside the executable (new town icons, new terrains, modified monster images, etc.). Moreover, the quality of the graphics can be higher than in the original Heroes, so the game is transformed in many ways. As for the game mechanics, WoG allows you to make various game settings, so you can adjust the mechanics to your liking. Of course, WoG significantly affects the familiar game mechanics on standard Heroes maps, which you are already used to, which is why the change in balance during WoG modification is irritating. And the culture of WoG maps is not yet very developed, but there are also good examples – on the maps of Grigori Minchev, for example, there is a script to disable WoG, which allows you to maintain the balance on the maps that the author has created, regardless of the WoG settings of a particular player. This is one of the possible ways to avoid confusion and imbalance during WoG modification.
But it is important to understand that there are standard Heroes, and there is WoG – that is, modified Heroes. If you want to see Heroes that have been modified in any way, then you cannot do without WoG. And there can be no compatibility here, at least for the time being.