While it's possibly indeed a further z8/z18 family incarnation, i'd say changes might be more profound.
To me, the lines underneath the tarp suggest something like this:
it may indeed be a more profound derivative of the z-8/18 family, there were rumours a little while back that something like that might be happening, with even some speculative CGIs showing a helicopter that looked somewhere between aw101 and nh90
seen here in a few images of this post over on CDF
(can't be bothered downloading and reuploading here atm)