The new 42,500 seat Allianz Stadium in Sydney was officially opened on August 28 2022.
Cox Architects were the Architects on this and the original stadium. John Holland were the builders.
The Media release can be viewed at https://www.allianzstadium.com.au/articles/allianz_stadium_official_open
Some other links are:
Wikipedia Article which describes the contractual story in some detail: https://en.wikipedia.org/wiki/Sydney_Football_Stadium_%282022%29
Channel 7 News Clip: https://www.youtube.com/watch?v=eJoX0u5uQ3M
More details later. (Aug 30 2022)