he's with his sister right now, nothing on luo yet, but based on how the story is going, she's either another desolate person or she's from an even higher level continent?
The translation is completely caught up with the raws. He's currently reunited with his sister. I doubt he'll see that luo girl in the next arc since it's probably going to be desolate race stuff.
He met her sister a few chapters ago and since TMW is still ongoing and new chapters are immediately translated the matter with Lou Hou'er still isn't that clear..