Does this mean i can finally use grand marshal polearm as my 2h sword transmog??
MIND BLOWN ****
AFAIK Polearms have different animations to 2h swords, axes, maces, so probably not.
From what Blizzard say they would allow you to transmog to different weapon types, but only if they share similar animations. I don't know exactly what they're planning but based on that it puts transmoggable weapons into the following catagories:
Staff <> Polearm
2h Sword <> 2h Mace <> 2h Axe
1h Sword <> 1h Mace <> 1h Axe
There is already an open discussion: