I was also a long time MTG mono black player. This deck is far from a cookie-cutter deck but since most decks out there are ally-less Moonstalker decks I decided to try out something different and this deck is the result. In a 40 card deck size environment, Wulven ally-less and ally play is viable, though I'm leaning more towards ally play since when you play a 40 card deck you don't necessarily get all the cards you need straight away and cards that help you draw become that more important and it may allow you to potentially do more damage to your opponent until he manages to turn the match in his favor. I've been experimenting with a 40 card Wulven deck lately but it's a long way from finished and it needs a lot more playtesting before I can make a definitive choice on the cards I want to include and which can help me against the majority of decks which are currently played.

I'm going to help be part of the testing process. Is it confirmed that we are moving to 40 card with 1.26?

No, not yet but the only confirmed thing is that the transition to a 40 card deck is going to be a slow process and not done overnight. First they are going to introduce it through the tournament, then the decks you can buy at the merchant and lastly the game itself.