Well, looks like my suspicions were right—a new restaurant is indeed opening up in the old Pono Soul Farm Kitchen space. Saima Thai & Sushi is moving in and is “coming soon.” There’s been activity inside since the start of December; my guess is that they will open either a) in time for the holidays, or b) after the new year.
Update 1/10/18: Thanks to commenter Gabe below, looks like the people behind Saima Thai & Sushi are the same ones behind King Curry in Milwaukie. King Curry gets high marks on Yelp, and just looking at their menu, it’s full of familiar dishes to the average American Thai restaurant diner—along with what look like some Chinese dishes (e.g., Kung Pao, Orange Chicken). I’ve been keeping an eye on the place, and they have removed some of the window coverings. I hope that means they are opening soon.