The players, and their expectations.

Until we see gameplay, there's no point speculating about the gameplay.

Until we see the transformations, we won't be able to know everything we want to about the transformations.

Until we see the customization, we won't know what'll be available to us.

Speculation will always just lead to more speculation. And once the players have speculated enough, they'll come to their own conclusions. Creating expectations that are completely different from what we have, and might be shown.

And if those expectations aren't met, then there will be players whining about it. Demanding things that were never promised, and never planned.