"Well I don't ever disclose what our plans are," Braun told MTV, "but I will say this: he's been writing one to two songs a day for the entire tour and he actually labels them by the city he writes them in."
That is quite a few songs.
"We started calling it his 'music journal' and we're talking about what should come next musically," Braun continued. "And I think creatively he just wants to share all his thoughts through music."
Because this is 2013, Justin started using the hashtag "#musicjournals" this week, so we'll see where this goes.