Probably toward the end of this year or the beginning of next but the next possible Nintendo Direct is too soon and I don't think Nintendo, unless the new Leadership really wants to stray from previous practices will show off one of their major games at a primarily third party event like Gamescom or TGS.
At most I expect we might get a brief teaser or a actual subtitle for the game between now and the end of the year but no major reveal footage or anything.







