so I thought there sould be a thread to discuss the perks we can acquire as shown in the demo. I screened everything to do with perks for you guys.

Source.
Slow down there... I don't know if I like the idea of my skill points being effected by whether I invested in secrets or forces. If we can unlock everything, I wouldn't mind, but that could be a problem if we have to pick and choose.
There are no exclusive decisions on how you choose to level up your inquisition. I can't say if you can unlock *everything* or not (I don't know), but you can see the choices available to you and are free to make a plan for how you best want to grow your Inquisition.
I heard somewhere that the perks and power are different for Orlais and Ferelden- is there any truth in this?
I am not sure I understand the question. Are you asking if there is like a Power - Orlais and Power - Ferelden category?
Yeah
I'm not sure where I heard this from, but it sounds like a lot of effort from a programming PoV, and I think it'd make more sense for the Inquisition to have a sole power and perks from a storytelling PoV, which I'm sure is what is actually happening but I swear I heard differently somewhere :L
Unless something is completely hidden from me, the Inquisition Perks screen is not dependent on Orlais/Ferelden. So yeah, just what we see.