Good point. Misunderstandings or failed fact-checking are likely in magazine articles, but outright invention is not.
So, at the moment I guess it looks like Orlais and western Ferelden, with the Dales as one of the parts of Orlais we can visit. The Free Marches are on the other side of Nevarra, so they seem like a less likely destination.
I think the Free Marches will be included because they're rolling over some of the storylines from the scrapped DA2 expansion, Exalted March, into DA:I.
It appeared at the time that Exalted March would be set in a number of Marcher cities (Starkhaven, Wildevale, Estwatch) and I remember devs saying on multiple occasions that the significant plot points of the expansion would be re-used in Inquisition.