Imho, the new way for rogues assassins is full DEX/INT, dual-wielding eMG, twisting tier4 Unyielding Sentinel or Fury of the Wild weapon alignment buff, twisting the tier 1 1.5 more W and tier 2 3% Doublestrike from Grandmaster of Flower. If you don't go into Shadowdancer, you could twist the +6 DC to Assassinate instead of the 3% Doublestrike.
However I think, there is no reason to take anything else as a primary ED than Shadowdancer. If the bugs are fixed with Devourer and Executioner Strike we are talking about 4 instakill-mechanics on different cool downs. Hard to beat and hard to not top the kill count in any group.