I've played a bit yesterday, and was quite disappointed.
Fortunately didnt have to face any unitless decks, but i saw lots of other Calveit players, except they were all using the usual midrange stuff, same soldiers, same Gold Viper Witchers, same Roach, Fringilla, Vivienne combo, that all other NG Leaders also use.
Its a shame, because NG offers a lot of different possibilities.
Personally, im using my "friendly Calveit", that its a Cahir/swarm deck with absolutely no damage or destruction to the opponent.
Now i see why nobody uses Cahir - its hard to pull off properly, and when you can actually get immune Cahir, most opponents immediately give up seeing they have no chance, or are total beginners, and its not satisfying to crush noobs without decent cards.
On a side note, only faced 2 Demavends, but they completely destroyed me, one with Kiyan, the other with a brilliant last play Foltest Pride. I thought i was gonna win, was 50pts ahead, and most of R3 he was just boosting with Vysogotta (and i had Yrden), but that Foltest Pride wiped my board except my immune Cahir.
Demavend players are probably the most strategic in Gwent.