Is it possible that Vin if ressurected by whomever may be awesome enough to revive her isn't in fact "Vin" but Preservation(mentally at least)? Perhaps the change from mortal to "god" is permanent.... and if so she will have a totally different perspective on everything. She may have founded the Ghost Bloods for her own supernatural goals like preserving the area around Roshar.
I do not believe Mr. Sanderson ever said Vin's story was dead, but he said the Vin/Elend story was dead. This does not rule out the return of my favorite fictional bad-chull lady!
I am terrified though, if Nightblood is in Szeths hands and faces Vin... I can't have her die again... Not for a lost planet like Roshar.
As you can tell I am finishing up my bottle of irish whiskey tonight!