I want to start with a disclaimer:
This is not confirmed to be a Haruhi story!
Someone got a copy of
The Sneaker - Premium issue to celebrate the 25th anniversary of the label/magazine and posted an interesting scan:
This is an advertisement/announcement that the anthology celebrating the 25th anniversary of
The Sneaker will be released on 7/1. In it will be a short story by Nagaru Tanigawa with illustrations by Noizi Ito. The title at the moment is "Round-Trip", but that is subject to change. The only title the two have worked together on is of course
Haruhi, but this is not confirmed to be a
Haruhi short story. I think it's likely to be one, which is why I'm posting it in here, but I cannot state with 100% certainty that it is.