Not the greatest picture (the camera has trouble with fluorescent lighting, no matter what color setting I use), but it's definitely a flower bud. This plant had flowers on it when it first got here, in May, but I haven't seen any since then, so this is pleasant.
The plant's been behaving a bit strangely since May: the leaf color has changed (they started out green with dark gray/brown veins, and are now solid gray/brown), and a number of sprouts of the plant have begun poking up next to the pot, all around its circumference, which I didn't expect but am told is normal for Kohleria.
Since it seems to be happy, I'm going to chalk the weird behavior up to the usual getting-to-know-you process and see what happens next. I might be able to post pictures of the bloom later, once that happens. The Chirita 'Deco' is flowering again, too, which I'd like to get better pictures of that than I had the first time. Maybe a double feature, then.