I'm going to try to temper my expectations with this next direct.
The two directs we've gotten this year have been so great already, and unlike last year where big titles like Animal Crossing or Luigi's Mansion had to be announced as a pick-me-up for how dry the year was at that point - and also probably because we already knew what titles were coming in early 2019 since they had been shown/teased for a year (Yoshi's Crafted World and Fire Emblem: Three Houses, which at the time was scheduled for first half of 2019) - those kind of announcements just aren't necessary. I mean, by the time the next direct comes out, we'll still have Pokemon, Luigi's Mansion 3, and Mario and Sonic At The Olympic Games left, and possibly Link's Awakening, Daemon X Machina, and Dragon Quest 11 S as well ...
The one smaller game i'm really interested in, Bayonetta 3, will probably not be shown off until The Game Awards, since it was announced there and they'll also probably to stretch Astral Chain's legs ... even if it doesn't sell well.
I'm going to say if any smaller titles for next year are revealed, they will be a new Kirby, Paper Mario, and/or Mario Sports game.