Comments by Date (6)
The wording suggests to me that they are just being cute. The murlocs are making a choice of Alliance or Horde. Seems unlikely that you have to pick one or the other. They probably should have worded it so as not to given even a hint of that impression.
They do seem to still be uncommon when learned, yes. Makes sense (despite the rarity), since they did say that all crafted pets should be uncommon now.
For those looking for this, it seems the rare spawn he drops from has a respawn timer of 50-90 minutes. I've had him be up when I come check slightly before 1 hour, and sometimes I've had to wait 30-40 additional minutes.
Just hope you have better luck than I do. Currently at ~50 kills and counting. O.O