I would assume that pre-ordering gives access to the U47 Shifter/Iconic now, and maybe the cosmetics and mounts.
Ah, that makes sense. So definitely useful if there's one point of ability that you need to pick up in a tree and can't quite afford it. This might conceivably be more useful once they reveal their ED revamp, but since right now you get all your points straight away at 20, it seems very niche. The Universal and Racial points from Ravenloft/Sharn were better because they provided a distinct benefit from level 1 that was otherwise totally unavailable. This isn't in the same league - but again, that could change depending on what the ED revamp looks like.It gives you an additional point to spend on your active destiny. Has nothing to do with twists of fate.