In addition to the burst of recent research articles, there are a couple journals putting out CfPs for corpora-related topics.
Études en Didactique des Langues (EDL) will publish a special issue on didactic (instructional) uses of corpora. The link is to a French-language page, but if you don’t read French, don’t worry, you can find a PDF of the CfP in both French and English in the list of documents. If you have trouble figuring out which document it is, the date on the document is 17/09/2017.
And finally, not a corpus-related issue, but an interesting (to me) special issue nonetheless, The Language Learning Journal put out a CfP for an issue focusing on the use of video and other audio-visual material.