WikimediaPageViewService won't query pageview data for today or yesterday. Excluding today makes sense since the API doesn't seem to return any data but yesterday is available and interesting even if it can be wrong due to processing lag. This is current hardcoded to $this->lastCompleteDay = strtotime( '0:0 2 days ago' );
The Growth team's newcomer homepage impact module (T216217) is using this service to show pageviews of recent contributions and we would like to have the option to include yesterday's data in order to show data as early as possible even if it is not always right.
We're flexible about how exactly this is configured and can work on the implementation with guidance from whoever is responsible for the PageViewInfo extension.