Athearn may have made this announcement at the convention:
N scale details and accessories
Box van. Atchison, Topeka & Santa Fe; Burlington Northern; Delta; Denver & Rio Grande Western; United Parcel Service; Western Pacific; and painted white but unlettered. Injection-molded plastic with clear window glazing; cab interior with separate, factory-applied steering wheel; and vinyl tires. $34.99. August 2022. I found this on Model Railroader's News page for this week, but Athearn only shows the white unlettered version on their website.
Edit: The "vinyl tires" are most likely copied from the HO model, in which the Athearn website is also only showing the white unlettered version. The 1/87th Vehicle Club's New Product page has the artwork for all of the paint schemes, and the HO models were announced on July 1, well before the virtual convention.
http://www.1-87vehicles.org/New%20Products/current.php And, Athearn is also releasing another batch of N scale UPS 40-ft drop frame trailers.
http://www.athearn.com/Search/Default.aspx?SearchTerm=40%27+parcel&CatID=TNVT Maybe the Athearn News email with these announcements will be coming out this week?