Well, it's time to reveal a little more:

The campaign will have a version with and without voice acting (for those who enjoy immersing themselves in the story cutscenes, as well as for those who don't particularly like synthetic voices).

Also, there is a high probability that there will be two voice acting versions: Russian and English (I'm not sure how to popularize the latter among the English-speaking community, and I don't know if they even play single-player campaigns).