Q u o t e:
Yes, everything pre-Icecrown Citadel will drop triumph in the patch.

Correct.

Bosses in Naxxramas, Obsidian Sanctum, Eye of Eternity, Ulduar, Trial of the Crusader, and all Heroics will drop Emblems of Triumph. Bosses in the Icecrown Citadel 10- and 25-player dungeon will drop Emblems of Frost. Choosing the Random Heroic Dungeon option via the Dungeon Finder (new in content update 3.3) and completing whatever dungeon is selected for you will award you with two Emblems of Frost the first time you do it (this is in place of the daily Heroic dungeon quests which are being replaced with weekly raid dungeon quests). Continuing to use the Random Heroic Dungeon option within that same day to complete dungeons will award you with two Emblems of Triumph each time in addition to those dropped in the instances. The random option can also select Heroic dungeons to which you may already be saved, so you can technically do every Heroic dungeon more than once in a day by continuing to use this option.