Ultrapremium is mainly for if you want to use the alternate weather data provider, Weather Underground, on Apple Watch. You also get radar (US only) on your watch, plus some additional weather map options on the phone.
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Technically, it's not possible to have multiple complications from the same app in the same "type" of complication. I had a workaround for this previously where I "took over" the complication of one of my other apps if you had it installed to show weather data instead, but I haven't updated that app to support the new complications yet. I'll update that one soon, so you would be able to have a max of 2 complications in the same slot.
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Currently, the options for the circular complications are: temp + condition, temp + hi/lo, temp + wind speed, wind, temp + uv index, uv index, temp + precip chance, precip chance, humidity, pressure, visibility, dew point, and cloud cover.
A sunrise/sunset complication will be available in my next update!