It's certainly fantastic and unprecedented, that different user bases, from very different types of platforms are able to come together and interact from their platforms of choice.
We may be witnessing a disruption right now. I do see more benefits than drawbacks with federated content, but that could just be my very biased point of view.
Why not add it to a wishlist, then purchase it when it launches, or when it goes on sale?
I have never pre-ordered anything, because it always felt like I would immediately lose my money, but yet I can't use or have the item I paid for. Maybe it's just my insecurity when it comes to finances.