A circa-2017 site plan shows renovations done over the past 3 years. These have added a new Saks store, West Wing (in gray) and "jewel box" retail building (in the northeast parking area). "Galleria V," once used to designate a reconfigured Lord & Taylor space, now denotes a reconfigured Marshall Field's-Saks building. 

The new (and relocated) Saks store encompasses 2 levels and 198,000 square feet. It was built on space previously taken by GALLERIA III.
Drawing from Saks, Incorporated

The old  Saks has been repurposed as inline store and restaurant space. Tenants include Fig & Olive (Mediterranean cuisine), Coach, Nobu Houston and Kappa Toys. 
Drawing from www.simon.com / Simon Property Group