Little bit of catchup here — this actually broke several days ago.
In a conversation with theorycrafters after unveiling how the various new trinket procs would work in Patch 5.2, Ghostcrawler noted:
RealPPM procs still scale more frequently with haste, which many specs have drastically more or less of.
He followed that with this juicy new tidbit, when asked whether the Real PPM system counts Slice and Dice as haste:
Yes. RPPM uses the highest of all haste/attack speed/cast speed effects.
This whole topic exists dangerously close to the Rfeann-Doesn’t-Know-What-the-Hell-He’s-Talking-About precipice, so I won’t try to get too deeply into this. But as a quick refresher (assuming I have this right): The Real PPM system was set up to make the frequency of our procs more reliable, yet at the same time ensure they still feel random when they happen. Real PPM currently manages how often our primary weapon enchants (Dancing Steel, Elemental Force, Windsong) proc; as of Patch 5.2 it’ll also manage procs for our new trinkets.
Now that we know Slice and Dice affects our Real PPM proc chance, we… well, most of us won’t be impacted too deeply, since this is mostly of interest to theorycrafters and those who are calculating the values of our shiny new trinkets in 5.2.
One thing this knowledge *does* do, though, is drive home just how important it is for us to get SnD up as quickly as possible in a boss fight, since we now know that in addition to all of its other benefits it also increases the proc chances of our enchants and 5.2 trinkets.