The stadium has passed preliminary assessments on Saturday, but will be under-going full assessment by a team of engineers on Tuesday and Wednesday. At that point an official announcement will be available. It seems at this point to have escaped largely unscathed. The next Rugby game at that ground is Spet 25, which allows plenty of time for a more full review of all possibilities.
I myself felt the earthquake as I was awake in Invercargill at the time. It wasn't powerful down here, but certainly very noticeable.