The accessories listed in the feature notes are the only new Interlude accessories in game. The same accessories were also in the Korean service with the launch of Interlude -- no more or less. :)
The only other ones I recall from the Korean PTS were the two tricorne hats, brown and blue. All the others may be coded into the game, but made available through later means.
Recently on Korean fansites I'm starting to see more and more pictures of the black and dark purple-ish feathered mask (http://img405.imageshack.us/img405/8017/911176380679ex7.jpg) popping up, so that's been made available over there somehow. Another new accessory was tied to their Valentines event.
But yeah, there were also quite a few on the Taiwan PTS.