After some further refinements to ShadowCraft, including updating the stats for used to compute the EP values to more accurately reflect T14 Heroic BIS, I have revised EP values for the major stats:
| Stat | Value |
|---|
| Agi | 2.72 |
| Yellow Hit | 1.80 |
| Mastery | 1.15 |
| Expertise | 1.08 |
| Haste | 1.02 |
| Crit | 0.99 |
| White Hit | 0.64 |
Note that this assumes BIS for a NE Rogue running LW/JC. It also makes some assumptions about the existence of certain pieces of gear - the Wowhead/WoWDB datamined information is somewhat inconsistant. Finally, I assumed that Hydraulic Sockets can only be filled with the legendary gem - i.e., if one is double-wielding Spiritsever, only one will be gemmed. Depending on the validity of such assumptions the values might fluxuate by a few hundredths relative to each other, but this should be pretty close.
In terms of notable consequences of these weightings (and the nature of high-end gear):
1) Higher ilvl is almost always better. Quality of itemization makes at most about a half-tier of difference (i.e.,
[Legguards of Failing Purification] (503) is slightly barely better than
[Legguards of the Thousandfold Blades] (509), and that's about the only place I've found where a lower ilvl item beats a higher-ilvl one).
2) Amongst items of the same ilvl, more sockets is better than less sockets, agi socket bonuses are better than rating socket bonuses, and having mastery is better than not having mastery. All other factors (i.e, other secondary stats and gem color) tend not to matter very much.
3) Pretty much all socket bonuses are worth getting. The worst case is a blue socket with a crit socket bonus, where you're trading 80 agi for 60 crit and 160 hit - which in practice means 60 crit and 160 haste on account of reforging. And as 80 * 2.72 = 217.6 while 160 * 1.02 + 60 * .99 = 222.6, even that is worth matching colors for.
4) 4/5 Tier is BIS. The legs are the best offset piece, even if you can't get the elite version. Helm and Chest are BIS on stats alone, independent of socket bonuses; Shoulder and Gloves are moderately inferior to the offset versions on their own, but not by enough to justify breaking the set.
As an aside: in said BIS gear, ShadowCraft shows 116382 DPS for Ambushing out of stealth, versus 116303 for Mutilate, for a difference of 79 DPS, or less than a tenth of a percent- confirming the general principal that it doesn't seem to actually matter very much.