If all goes to plan, it'll be at Western Springs. Artist's rendering below.
It's supposed to be "at least 18,000", but you can see there's room for expansion if it's needed.
Currently there's speedway at the venue, but they're attempting to do a stadium shuffle. Cricket from Eden Park to Western Springs, speedway from WS to Mt Smart, and League from Mt Smart to QBE / Eden Park. Eden Park is too expensive, and a terrible shape for cricket, so that has been the big catalyst, but articles suggest potential AFL matches are at least on the mind of planners, so hopefully that means the field is big enough for AFL
That was the plan at least. I believe Covid is delaying things because I haven't read much recently.
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Looks awesome, cheers