Complications are no go on full android watches. Closest you can get is by installing /thread/1529/universal-launcher-new-generation-2 and using one of watch faces that has calendar support (ricktop added Calendar support some months ago)
Yes I know, but complications shows some live details from the linked app. E.g if you make a complication for the system timer, the time left for the timer will be shown in the watchface, and if you click it you will then get to the app and see it’s full interface. I would like to have a countdown timer in a watchface, which will alert me on timeout. It seems not doable at the moment, but with a complication, it would be possible.
Nobody will be able to give you a binding answer to this question. Personally, I wouldn’t expect that in the near future.
But, just to have answered your question exactly: there is always a chance in the future.