Q:
question about transmuting legendaries
A:
You will get the legendary effects. Before the ascended weapon update people would transmute legendarys onto exotics because they didn’t want the default soldiers stats.
Roaming/Raid Mesmer
Doubtful. A skin of a Legendary weapon isnt an actual Legendary weapon, it’s simply the look of a Legendary. Plus unless someone has so much disposable income in the game to actually throw one away testing this, a concrete answer wont come until the 15th outside of an anet staff saying yay/nay.
If you really can get the effects without the skin, I am going for Frostfang minus its skin.
Apologies to those who may find my posts on GW2 forums offensive and hateful.