They are using Rogers Marvel Architects for their overall campus design, and the renovation of the Braniff Building and the new employee services center facing Kerr Park are both very simple, modern glass designs meant to compliment the existing tower. The are also using Rand Eliott for the tower interiors, and we all know he is a true modernist.

This is a concept from when they originally proposed their plans and it's interesting because it does show a bigger building replacing India Temple and the east parking garage. Here, it is only about 10 floors but this was obviously a very preliminary design. You also see highlighted three additional buildings along Broadway which are currently vacant lots owned by SandRidge. I suspect one or all would be parking structures for their employees.