Please don't take my words for granted, I can't speak for anyone else. But maybe I'll bring at least some insight into this for you.
ShadowCraft essentially consists of two parts - ShadowCraft-Engine and ShadowCraft-UI. The former is what makes the calculation and the latter is web front-end you can find at
ShadowCraft - Rogue DPS Spreadsheet.
Nextormento, Pathal and maybe some others are doing some great job with getting ShadowCraft-Engine ready for Mists. This is where more tech-savvy users are already getting info about future stat weights, optimal cycles and so on. I am quite sure we'll see some PvE guides soon - and those will be most likely based on ShadowCraft-Engine results
ShadowCraft-UI, on the other hand, is maintained by Antiarc and last public message we got from him is
this one. I might be mistaken, but currently it doesn't seem like there is some ongoing progress.
All I am trying to say that
ShadowCraft - Rogue DPS Spreadsheet might stay in it's current broken state for quite a while. It's not some random bug that can be fixed overnight. And until Antiarc (or someone else) decides to fully rewrite the application for Mists, we are stuck with PvE guides and, if you can use it, ShadowCraft-Engine.