So...where might the Urumi fit in a Weapon Group for a Fighter... Its's a "terribly sharp longsword"... that appears as a "coil of steel, similar to a metal whip" It also has reach, can be wielded against adjacent character, can disarm (+2 to disarm) and IMHO probably should be allowed to Trip.
I lean toward grouping it with the Blades, Heavy group but see where it could also be grouped with the Flails...along with the majority of Disarming Weapons.
I'd love to see an official ruling, and maybe a picture to lol.
I have a player wanting to use one for her Fighter in CoT