At this very moment, Source Sans is still not an option and there are also questions to be answered to determine whether it fits the requirement of DFSG.
Comparing wqy-microhei and fonts-droid, there is no reason to continue using microhei anymore, because after several updates of Droid Sans, the coverage problem is already improved (and wqy-microhei stops its development right after this is the fact) to be wider than wqy-microhei.
At this very moment, Source Sans is still not an option and there are also questions to be answered to determine whether it fits the requirement of DFSG.
Comparing wqy-microhei and fonts-droid, there is no reason to continue using microhei anymore, because after several updates of Droid Sans, the coverage problem is already improved (and wqy-microhei stops its development right after this is the fact) to be wider than wqy-microhei.