The mod will continue.

[Alletun]

that's too detailed for ingame

Actually it isn't. The details lie with the normal map which the engine supports, but CA dont utilize very well. The polycount for that orc head will be only slightly higher than an average vanilla head.
Ofcourse the lowpoly one wont look just as smooth as this one around the edges, but close.

are you gonna use that for faction portraits for example?

yes

Or animated CGI videos?

maybe ... i guess you'll just have to wait and see