Oh really? I was not aware. I do not ordinarily play on the PTR so all of my data is coming from the patch notes. I did not see that in the PTR notes or the official 2.3 patch notes, so please feel free to send me the link as I hate posting things while misinformed.
If what you say is true though, then maces would do just as well as fists for sure, but given that most rogues use swords due to better itemization that would be why most specs you see have sword spec instead of mace/fist. But as to would either one do better than swords? That would require someone with both swords and fists to test. Sorry I wasn't more helpful. :-(