Three more volumes are slated for release in the new UK Penguin Classic Maigret series:
Maigret’s Holiday. Inspector Maigret #28 by Georges Simenon, Ros Schwartz (Translator) Published 4th February 2016. Original title: Les vacances de Maigret, 1947.
Maigret and His Dead Man. Inspector Maigret #29 by Georges Simenon, David Coward (Translator) Published 3rd March 2016. Original title: Maigret et son mort (1948).
My Friend Maigret. Inspector Maigret #31 by Georges Simenon Published 5th May 2016. Original title: Mon ami Maigret (1949).
According to my information they are among the best in the series. Source [Life on La Lune: The top ten Maigret novels]