This Daily is located back in Shattrath, and given by a Draenei called Exarch Nasuun. He will be located in A'dal's chambers, in the northwestern Alcove where G'eras, the Badge of Justice vendor, used to be (G'eras himself is now on the walkway above the Alcove). He'll send you to the Bash'ir Landing, on the northern plateau of Blade's Edge Mountains. This means that this daily will require you to have a flying mount. Once you receive the the quest, you can fly to Evergrove in Ruann Weald via flightmaster, then fly northwest from there on your mount to reach Bash'ir landing.
Once you're there, you'll want to kill any of the Ethereals until you receive the Bash'ir Phasing Device. The device is a very common drop, so you shouldn't have to kill more than one or two ethereals until you get one. This Device will put you, your pets, and your group members into a state not unlike the Mage spell Invisibility. You will not be able to see any non-phased players or mobs, nor will they be able to see you. This device, however, only works with Bash'ir landing, and any pets or groups members must stay within 100 yards of the person who used the device to get the benefit. As long as you stay within Bash'ir landing, the effect is permanent, although you can right-click it off.
Once you're phased, you will need to start looking for your quest objective, the Smuggled Mana Cells, which will appear on the ground as translucent hot pink boxes. The boxes will appear mostly near the machinery and other stacked boxes around the camp. They will be guarded by Phase Wyrms, which should be relatively easy for a level 70 take out, and drop Motes of Mana for a nice little bonus.
Once you have your 10 cells, you can drop the phased buff (Be careful for any ethereal aggro when you do. You can't see them while phased, but they'll be there when you come out of phased mode), mount up, and head back to Shattrath. Upon turning this quest in to Nasuun, you'll get 10 gold, 10 silver, a cache of Shattered Sun Supplies, and some credit toward the opening of a portal to Quel'danas on your server. All in all a very worthwhile quest, especially if your cache has a Badge of Justice.
Once the portal is opened, this quest will be renamed "Maintaining the Sunwell Portal," but the objectives and rewards will remain the same. For more information, you can also read the pages for this quest on Wowwiki and Wowhead.