Usual disclaimer: the following information is as of the Mist of Pandaria Beta build 15952, released on August 07, 2012, and may not be accurate once future patches are released.
Here are some updated graphs from the latest patch:
During this latest build release a number of abilities took a straight 8% nerf to the face (Shadow Word: Death, Shadow Word: Pain, Mind Blast, Mind Flay, Devouring Plague, and Vampiric Touch) while a few of our talents got buffs (Shadow Word: Insanity by +25% and From Darkness, Comes Light increasing bonus damage to 50% from 20%).
The overall result of this is that DPS numbers across most encounter types have largely leveled out. Additionally, the buffs to From Darkness, Comes Light mean that it is now the best choice from the Level 45 talent choices. The only exception to this is for Heavy Movement fights where Mindbender still wins out. Shadow Word: Insanity is still last but has closed the gap in little to no movement/raid event fight types, with Helterskelter and Heavy Movement still being horrible fights to use this talent.
The DPS changes by talent and encounter combination are as follows (raw DPS and percentage of the previous DPS total):
Lower DPS across the board, less DPS loss (or slight gains) on the combinations which had From Darkness, Comes Light and Shadow Word: Insanity because of its buffs. Also, these DPS losses aren’t as extreme as they might have been because of some internal changes to SimulatioNCraft and how it handles trinket proc rates (they’ve gone up, meaning more DPS).
Haste is now the worst stat for Shadow. This is attributed to the nerfs to all 4 of our DoTs (Shadow Word: Pain, Devouring Plague, Vampiric Touch, and Mind Flay) getting an 8% damage nerf which outweighs the other cooldown limited ability nerfs (of also 8%), in conjunction with the buffs to From Darkness, Comes Light and Shadow Word: Insanity.
In short, our talent choices have a bit more of an effect on our over all DPS.
The second item of note is while the values of Crit, Mastery, and Haste have all dropped, Hit/Spirit and Spell Power have had their values increased. Once again, this is because the use of the increased importance of Level 45 talents in our overall DPS profile.
Notes and Resources
The SimulationCraft profiles changed slightly from the last post to this one.
These sims were for fights that are single-target. Multi target fights may (will) have different results.
These sims are as of Mists of Pandaria Beta build 15952, released on August 07, 2012. Once a new build comes out, these values will no longer be 100% valid!