Random Skins?

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Ciunay_Ragathol wrote:

will unique items have fixed stat bonuses and higher than random generated drops?

No.
That's not what uniques are for - the most powerful items in the game will be magics are rares with great random mods. Uniques have mods which don't otherwise occur which aren't powerful per se but are different and enable different ways to play, and off-the-wall builds that would be much harder to support with the standard mods - the idea is that when you find a unique, you should be tempted to start a new character with a cool, different build to take advantage of it's mods.

Endgame gear for a character is expected to be almost entirely good rare and magic items, with some characters having 1-2 unqiue items which work well with their build.