3. Ilum
The journey to Ilum is somewhat of a Jedi pilgrimage. There are crystals there strong in the force, perfect for making lightsabers, and it was once considered an important point in a Jedi's training to gather his or her own crystal and make a lightsaber from it. Assuming a new Jedi will rise in Episode 7, this could be a very Dagobah-like planet. Add to this that the planet was kept off star charts by the Jedi in order to protect it. Jedi had to feel through the Force in order to hyperjump correctly to it. That means it could be the first major test our new Jedi character faces, perhaps engineered by Luke playing an Obi-Wan role.