You can control the order of custom fields on Review page now.
If we are speaking about managing order pre-defined fields, and mixing them with customer fields on UI - we wrote down this suggestion as a possible future improvement, but there are no plans to implement this in the nearest future.
Frankly, I was a bit shocked that we can not order the fields in the Review Page however we want. That seems to me the whole purpose of setting up a review. The ability to create our own fields and put our own fields at the top of the review seems like a basic function. Why does "Smartbear" get to decide what's important to my group?