This might help you guys and is from a GM.
In order to access the new Hyjal/Firelands questing area, or begin the Elemental Bonds epic questline surrounding Thrall, you must first complete the quest "Aessina's Miracle", offered by Nordu in Mount Hyjal. Unless you begin and complete this quest, you will be unable to access these new questing hubs or questlines.
Once you have completed these Mount Hyjal quests, additional areas will open up that will allow you to participate in the Firelands quests. Please note, at first, these quests do not actually take place in the Firelands; access to the Firelands itself will come later on with the completion of further daily quests. Once the quest "Calling for Reinforcements" is completed, an additional questline to open passage to the Firelands will occur.
If you abandoned one of the Elemental bonds quests please follow the instructions below.
If you have abandoned Elemental Bonds: Doubt you need to go back and talk to Cyclonas in the south of Uldum again.
If you have abandoned Elemental Bonds: Desire you need to return to Aggra at the Abyssal Breach in Vashj'ir.
If you have abandoned Into Constant Earth you need to return to Aggra at Therazane's Throne - you will need to have finished the quest line which opens up the Therazane dailies to be in the correct phasing.
If you have abandoned Elemental Bonds: Patience and/or Elemental Bonds: Fury you need to return to Aggra south from Twilight Precipice in Deepholm.