It's not live on US servers, however myself and a few ferals that I know have already swapped out our UW's in preparation. Personally I never liked the trinket, couldn't be happier that I can drop it before I pick up Matrix.
Also I want to state how emphatically I love the Hungerer trinket. The proc rate is so fucking amazingly good. First hit every single time, and the moment it comes off CD, it's active again. It is better than sex.