That said, I believe you. Some press gets a hands-on on Wednesday (today) so unless they plan to pre-announce something (unlikely) or announce software only stuff, I think today is it.
Also, Studio and Pro are hanging there.
The streaming apps virtually all support downloading for offline viewing on iPhone, but the Apple TV just becomes a paperweight when the internet goes out, because I'm not allowed to use the 128GB of storage for anything.
If they're not going to let you use the onboard storage, then it seems unlikely for them to let you use USB storage. So, first, I would like them to change their app policies regarding internal storage, which is one of the purely software improvements I would like to see.
But there are some cases like e.g. watching high-res high-FPS fractal zoom videos (e.g. https://www.youtube.com/watch?v=8cgp2WNNKmQ) where even brief random skipped frames from other things trying to use WiFi at the same time can be really noticeable and annoying.