Not sure how they got the data, but this was being discussed I think yesterday or Sunday night in one of my LSs:
FF XIV Server Transfer Data (October 29 - November 25)
Ultros lost more than gained. Which is sadly, the norm. A majority of servers lost people, while a smaller group gained. Balmung gained the most people, followed by Shinryu, Gilgamesh, and Chocobo.
Balmung also enjoys virtually non existent gil spam since it's almost impossible to create a fresh new account on Balmung. You typically need to pay a transfer fee to get there on an existing character, and gil sellers don't do that apparently. Those that do get through are easily caught in the monthly sweeps.
Wonder when/if we'll see server mergers. Did that happen in XI at all?
Edit: Considering they made 180K off transfers in one month, I doubt they'll ever do mergers or remove transfer caps.