BSO previously reported that Pacquiao-Broner was likely to happen before Mayweather-Pacquiao 2.
With news coming in from various sources that Pacquiao has signed with Al Haymon, it means the fight will be happening sooner than later.
Likely in early 2019.
It would be a two-fight deal with Haymon and Pacquiao, the Broner fight and then the Mayweather rematch. This would by far make Pacquiao more money than any other fights he could take at this point in his career.
The Broner fight would likely happen in the states in Vegas, Pacquiao would have to clear up his tax issues before that time. No word on if the Broner fight would be on PPV, FOX or Showtime.