Yes, Han Solo is the one being set up to be the 'new Obi-Wan' in a sense, as he's going to be the old hand guiding the new heroes as they discover more about the galaxy and the Force, clearly no longer believing it all to be a hokey religion. In another sense, though, it may well be Luke. The idea here is that he's following in the footsteps of previous Jedi Masters, like Obi-Wan and Yoda, by becoming a reclusive figure, shut off from everyone else and trying to keep quiet about his powers. He'll then eventually be found and have to come out of hiding, either thanks to Finn and Rey or Kylo Ren and his fellow Knights. This one would fit with his absence so far, and if it's more about the search for him then would be different enough from Obi-Wan in A New Hope. As for where he's hiding, it's difficult to see him returning to Dagobah. Could he be back on Tatooine, or is that too obvious? The galaxy's a pretty big place to hide in.