The other places bit is starting to get a bit gnarly: I just don't know! I think we can at least have a fairly reasonable idea of the locations of Ego Draconis in relation to the original DD map (I think Farglow is somewhere we didn't mention, which would be somewhere further inland of the Fjords towards Aleroth, probably; and we've hazarded a guess as to where the D:OS map may be located, but other bits I suspect are yet to be revealed.
Actually one thing I did wonder about is the possible proximity of Fort Joy to Cyseal on the basis of its architecture (well, inasmuch as we can tell from some ruins) and that it was Braccus' playground. I guess that really depends on the size of Braccus' kingdom (or empire) though, and whether or not he preferred to remain around his seat of power. But I think that's a starting point and it would fit in with your theory that Fort Joy is at a more southerly latitude (that is of course assuming that the bit of Rivellon we're familiar with is in its world's northern hemisphere, unlike e.g. Thedas where all the game world we've seen so far is in its southern hemisphere) but I think we can probably take that for granted as Yuthul Gor, the hot and arid bit, is to the south.
I'm still working on the basis of the places we've seen so far being on the same continent, which is possibly a bit naive considering the dimension-hopping we've already seen in the series, but it works for me. I suspect some of the places mentioned so far in D:OS2 may be further afield, though I'd guess Arx may be intended to be in familiar territory.
