Operation: "Actually like Karamanero's/Malamar's design" is turning out to a raging success. The design is really growing on me, which is good.
Also, there's a confirmed Pokemon named "Oorotto".
If you were expecting pics, no, we don't know anything about it other than that it's real. We know about it because it was seen in the trailer that aired with the newest movie, and some people that have seen it are providing drawings of what it looks like. This seems to be the most accurate drawing, according to Serebii.
I guess it's supposed to be a haunted tree of some sort, likely Grass/Ghost. While that sketch does give us a very good feel for what it actually looks like, it's too early to make any final judgements. I'll probably end up liking it. It's really about time we got a proper tree Pokemon (Sudowoodo and Shiftry don't count).