Click on the links below to go to a full walkthrough of each daily quest:
You can find the new building just a bit south of the phase 1 building, where you will find the aforementioned tradeskill vendor and 2 new daily quests. The daily quests are "Distraction at the Dead Scar" and "The Battle for the Sun's Reach Armory."
In addition to the dailies for unlocking the Armory, there is now also a daily that will lead to the establishment of a new portal to Quel'danas from the middle of Shattrath if completed enough times. This quest is known as "Intercepting the Mana Cells."
Finally, once the portal itself is unlocked, there will be a new daily called Know Your Ley Lines, which isn't part of the progression, but is quick and easy and gives you an egress back to Shattrath City. You'll find the quest giver for this one in the Sun's Reach Sanctum building on the Isle of Quel'danas.
If you missed out on helping your server unlock phase 2, don't despair. All the Phase 1 dailies are still there, just under different names. You can check out Eliah Hecht's phase 1 guides here for help on completing those. For more information on both phases, you can read John Himes' phase 1 beta impressions here, or his phase 2 beta impressions here. Good luck with unlocking the next phase, and keep your browser pointed at WoW Insider for all the latest information about the Shattered Sun Offensive, patch 2.4, and beyond!