You can follow the development of Factorio: Space Age on their blog

Results are cumulative, so if the reviews were to be “Very Positive”, all resolve YES except ”Overwhelmingly Positive”.

The current close date is a placeholder, once the expansion launches I’ll change it to be 30 days after the release date. If there’s <500 reviews when I check, the close date will be extended until there is a large enough sample.

Heres a chart of how the Steam review categories work. This is just for reference, the market will resolve based on the text, not the % positive.