If they have located footage that Roger took of a person in a suit walking through woods - then aside from it being a valuable find for the archives:
a) we already knew a drama documentary was being made - this has always been known since the PGF was released - no change
b) it would be entirely expected that there would need to be such footage to put in the drama documentary. It would be pretty difficult to do it without - no change
c) if it is indeed the Ahtanum footage, as Kitakaze states in my comment above - it appears to match the timelines of the drame documentary footage, not the PGF - no change
d) if it is the Harry Kemble memo footage (whether or not that is the same as the Ahtanum footage), then Harry's memo makes clear that this has no similarity with the PGF in terms of filming timeline, camera, lens, filmstock, style or processing - no change
If there is no direct link to the PGF then they are merely selling us something we already have in a new shiny sensationalist wrapper. Given the rumours of the film maker and/or Clint Patterson pursuing people in their 80's and 90's - Pat Patterson and Bob Gimlin for confessions, it suggests no link and more than a hint of desperation to me.