When will the fields be announced for winter worlds in Phoenix this November?

Probably on or close to the entry deadline on Halloween (10/31/23) ...

Suggestions

This has always worked well for me. At both worlds and winter worlds.
Reserve a hotel on opposite sides of city. Reserve rooms that allow for free cancelation up to the week before. Click pay at hotel and once field location is announced you cancel the hotel that is farthest.

Field locations and schedules have been released consistently as soon as they can get it done. So us as players need to adapt to that and make plans.
Hope this helps

Vinny