Hopefully it's thin wall, I want this bird to get up as high as possible!
We know both from the leaked image that started this thread and from the page when the 2023 catalog was released that the OD is 1.21", which is the same as the typical heavy-wall 29mm motor mount, including that used by other Estes Pro Series kits.
At 1.176", Apogee 29mm tubing has 5.5% less frontal area and is 55-60% of the weight of 1.21" tube.
Rocketry Works lists a 29mm tube that purports to be even thinner (1.168") and lighter than the Apogee tubing.
For a low-thrust motor like the F15 (or G12, H13, etc.), practically any rocket is going to be over optimal weight, so the thin-wall stuff can probably be made to fly higher. It may run into heating problems though, as @PDawg