Well I'm not an expert on Treblinka like some around here are and I'll wait for the film and the more expert analysis from those folks before coming to any conclusions but as far as I know there will be nothing new presented here except the tiles with the Star of David on them most likely(which have already been addressed here so they aren't "new" to us either).
Brick walls and foundations from the gas chambers remain
Unless I'm thinking of a different camp these foundations have been known about for a long time and mentioned in several revisionist documentaries and papers/books as the outlines of them are visible even from aerial photographs. The idea that these foundations are of 'gas chambers" is based purely on the preconceived belief that the camp was a killing center - unless the foundations of the structures match all the models and such they've put together over the years for where the "gas chambers" were supposed to be they are merely proof that a camp existed there once, which of course nobody denies.
They will likely try to use the tile remains found there to claim "gas chambers" though, but since Eric Hunt has provided numerous witnesses testifying to real showers, delousing and steam chambers and such there once again it will likely be the preconceived beliefs of the existence of "gas chambers" that will be the only actual "evidence" presented.
as do massive amounts of human bone, including fragments now eroding out on the forested ground surface.
The existence of human remains is not a question as every camp along the Eastern front surely would have seen death to at least some extent during the war chaos and disease epidemics and such - the issue is the amount of remains which thus far at any camp have not come close to the "Holocaust" claims, and we'll have to wait and see how "massive" the amount of remains they claim to have found really are,
The last part of the statement does however completely shatter the idea that the Germans tried hard to cover up the evidence at all though as if they were able to find remains on the "forested ground surface" that means the Germans didn't even really try to hide them at all - apparently they just left remains unburied and scattered in the woods while trying to "cover up" the crimes? ...
That statement also reeks of possible fakery/planted "evidence" as even under the non-homicidal premises it was standard procedure to at least bury the remains of the dead to some extent. Unless these are partisans or communist Red Army commissars/propagandists that were taken out to the woods and executed and simply left to rot, as I believe a few revisionist sources claim evidence for happening at many camps(not sure about Treblinka specifically though) but you would still think they would at least try to bury the remains if they thought what they were doing was a crime of some kind.
These documentaries and "investigations" are not meant for the revisionist crowd, they are meant to bolster the beliefs of those who already have no doubt that such crimes occurred and will simply be used by them to further dismiss and belittle revisionism and ignore the actual bulk of the revisionist case by saying "here's your physical evidence you've been asking for".
But that's just my 2 cents.
EDIT: My apologies as I do believe I was thinking of Belzec in regards to the visible foundation outlines from aerial photographs, though again foundations of a camp structure that nobody denies existed is not proof of mass-murder "gas-chambers".