The Welsh Language Commissioner published this summary on the position of the Welsh language in August 2016. Half way between the two Censuses, it is a timely 5-year report.

http://www.comisiynyddygymraeg.cymru/Cymraeg/Rhestr%20Cyhoeddiadau/Adroddiad%205%20Mlynedd%20crynodeb%20Gwefan.pdf