Yeah Joker 3 had a huge decline. Still very profitable but as you say big decrease.
A ps4 and Vita release would do no harm, especially since all the other new games have been released there lately.
Dark souls 3 did great. Well up on bloodborne but down on Dark Souls 2 retail. Bloodborne did 45k digital first month (or was it week or 2?). So I'd expect a high digital ratio for this. Probably pretty even with dark souls 2 overall.