EU and ROW tracking on here has always been soft. However I think a 17-18M for 2018 for the PS4 will be a fairly safe bet and will g in line with a 90M/91M sales announcement from sony.
By all indications it seems the NS is even now outperforming the XB1 in the EU. Which is a bigger deal when you consider that NS now has 2 of the three regions won (assuming the ended 2018 winning NA).
2 of three??, and what about the rest of the world??, is a bigger marketshare than JP....