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It has been confirmed by the CM, Spunky, that no changes will be made for the NA/EU markets. The only reason for NA/EU testing phases is localization. Things will be identical to the way they are in RU OBT, and the feedback we've given through the CBT so far hold no weight on the current version of the game in Russia.
"No, we will not be making changes based solely on the EU/NA market ..."
This was discovered after a "CBT Feedback Response" recently posted was entirely copy and pasted from the RU OBT website.
Obsidian will only be responsible for helping develop additional classes and raids, outside of localization of course. They cannot make structural changes to the game, and are, essentially, only acting as a local publisher for the game.