Well the pokemon will most likely be a dual type. And ghost is in a huge lead. Grass barely following behind. Which is why it seems to be the best assumption that it will be a grass-ghost. But, if I'm correct, the next poll will have 2-4 options about which should be its dual type. (Ghost + ???) And the ones on the poll will be runner ups from this one.
EDIT: @ Urza's post
EDIT: @ Urza's post