I dont think we'll see new wards until everything is full. If Mist gets full, they could keep adding new wards, but then you'd have Lavender Beds and Goblet never filling up.
I got in and got a small plot in the prettiest spot of the Goblet IMO because I had a feeling these things would happen. If you dont want to wait, either try a different area or get a different size plot, at least smalls are getting expanded in a few days.
