Wildstar! It was the best playing mmo I've ever seen. The platforming was neat, the world was varied and cool, there was player housing with almost endless customisation! I miss that game.
To cancel something is to no longer do something at a future date. If the game was originally planned to exist in a year but no longer does, that meets the definition of cancelled. The OP question is strangely worded - how can you miss a game you were never able to play?