HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

It's a good thing, but it won't really change anything in the world of professional Heroes.

In the world of professional Heroes, it's unlikely that anything can be radically changed. Baratorch was talking about this in the video. This feature should help attract new players. When a person has the opportunity to download the game and play online from the game client, that's really cool. If I want to play, for example, Diablo or Hearthstone, I don't have to look for some forum, delve into the nuances of the game, negotiate with someone, etc.; I just click one button and play. Believe me, there are a lot of players who would like to play but don't want to browse forums.

I've already written (more than once) that the real breakthrough would be the development of software for streaming directly from the game. I've seen something similar in Dota.

In Dota, active actions take place in different parts of the map, and it's more convenient for the viewer (or commentator) to watch where and what is happening. In Heroes, all the actions take place on the screen, so the so-called "observer mode" will be practically useless. IMHO.