Here's an alternative where 2 out the 3 "will be"s have been removed:
Soon usability will be a commodity, something users will expect and not a leverage or key differentiator any more.
If this version is too long a sentence, here's an alternative:
Soon usability will be a commodity and something users will expect. It will not be a leverage or key differentiator any more.
EDIT
After reading the first alternative once more, I think it reads better if "any more" is moved from the end of the sentence:
Soon usability will be a commodity, something users will expect, and not any more a leverage or key differentiator.
EDIT 2
Or as suggested by @starsplusplus using no longer
Soon usability will be a commodity, something users will expect, and no longer a leverage or key differentiator.