The level 47 quests were there before, they appear once you rebuild the Waking Sands. However, you WILL need the level 50 quests which unlock Ifrit, Garuda, and Titan.

Also, as far as gear goes, I would highly recommend you not tackle the relic fights until you have a set of level 55 gear (Either the militia/imperial set, or drops from Wanderer's Palace. I recommend the crafted stuff, get it HQed). By the time you fight Garuda, you should have at least upgraded a fair amount of your set to level 60 gear from Amdapor Keep and Ifrit. By the time you tackle Titan you'll want a fair amount of level 70 gear, buying darklight with philosophy tomestones and hopefully getting a weapon from Garuda.