The 6th edition of the Metzler Lexikon Sprache has been published (Glück, Helmut & Rödel, Michael, Eds., 2024, Stuttgart: J.B. Metzler). It includes numerous contributions from Helene Schmolz and Daniela Wawra, primarily covering terms and topics in the field of sociolinguistics. 

The lexicon provides access to the entire current specialized vocabulary of linguistics and is the most comprehensive (printed) lexicon on linguistics, featuring around 5,000 articles. You can access the lexicon here.