I ended up with three pieces of Wrigley's Extra Sugarfree (yes, they spell it as one word) Gum in the Cool Watermelon flavor. Apparently it is a new flavor they wish to promote. Now I don't like gum, so even if this were certifiably kosher, I would decline to try it.
I've left my pieces on the chair of the Official MABFAN's Musings Non-Kosher Swag Food Taster this morning. I have no idea if she would be willing to try it, but if she is, we'll have a report.
And let me just add -- given the humidity, yesterday was not the day to be parading around Boston in a watermelon costume.