yes, I think so
no, we will loot the same 1H as other melee
Class fantasy is not tied to drops, you can have via quest, or special drops a lot of transmogs of warglaives, get that shiny swords from a raid boss and transmog them onto glaives, and done, your dh has it's cool looks.
I think blizz will go this route, so probably we have a few - not a lot - of glaives designs but there will be almost none warglaive from bosses. That of blizz adapts warriors and rogues to use warglaives as one handers.
But I seriously doubt it. Just transmogs.
of course there will be new glaives.
gonna be annoying that they're troll or human themed though.
Warglaives were dropping in the demo at Blizzcon in BfA. I think that pretty much confirms that there will be warglaives drops.
They should allow for blacksmith and inscriptionist to be able to craft them.