Was going to ask the same question - I ordered another N6 (returned my last one because of the constant reboots), just to find out two hours later that the S6 edge has finally become available here. Now I ordered that one as well - one of the two will have to go back again. Unfortunately, they'll only take them back if they're unopened, so I won't be able to just check out both.
I'm torn - the N6 was great, but the AF speed of the camera was insanely slow. Other than that, I always found it slightly too big (but I can live with the size, I guess). I heard that the S6 has terrible LTE / 4G reception, so that would be a killer, but I don't know if the people who wrote that just have faulty devices.
The N6 has a last-gen processor, no notification LED, a lower-res screen with lower max brightness. The speakers sound ok, but they tend to sound crappy at max volume (at least that was the case for mine).
The S6 Edge clearly looks better, has a faster processor , a better screen, a drastically better camera, but battery life seems to be bad and there's a possible reception issue. I'm in a bit of a pickle here.