patch 4.3 heroic dungeons will have their own category in the random Dungeon Finder, while the Zandalari heroics tier has mysteriously disappeared. Now, when queueing for a random Cataclysm heroic, the system will include the two Troll instances if your item level is satisfactory to enter. In addition, the Hour of Twilight dungeons, as well as any Cataclysm heroic, now reward 150 valor points per completion, up to seven times week. Any heroic will now grant the same amount of valor points.
Moving the Zandalari heroics into the general heroic pool seemed like it would happen eventually, considering that having multiple tiers of dungeons to queue up for could get confusing over time. Now, players will be placed into dungeons based on their ilevel and not necessarily which dungeon category they queue for.
This presents an interesting dilemma, though. Players who want to do a quick heroic right now can queue for a random, non-Troll heroic and be in and out with half the VP (and half the stress -- I'm looking at you, Jin'do) in half the time of a Troll heroic. In 4.3, it doesn't appear that you'll have the option. Then again, everyone at a high enough gear level to care about this stuff will just queue for the Hour of Twilight heroics anyway, right?