Yes, the melody is pleasant :). It seems that it will be used as background music during the heroes' "adventures." Here is a description of the previous melody:

This is the Week of Music!
This week we’ll hear some tracks from Heroes VI that are remixes of iconic themes from the Might & Magic and Heroes series. Today we’ll start with the Campaign Menu theme, that should bring back memories to Heroes III fans

This is Music Week!
This week we will hear several tracks from "Heroes 6," which are remixes of iconic themes from the "Might and Magic" and "Heroes" series. Today, we will start with the Campaign Menu theme, which should bring back memories for fans of "Heroes 3."

5p74, did it remind you of anything (I don't know the themes from the third part myself)? By the way, since everyone is talking about which old themes they would like to see in "Heroes 6," I like the melody from the main menu in "Heroes 4." Now about the video: as in the case with the Nagas, there are no complaints :). It's just a pity that they showed so few animations.