(Update: this paperback edition is new) I have just acquired two of the latest titles on corpus linguistics. Contemporary Corpus Linguistics is edited Paul Baker, a collection of seventeen essays on the latest (hence ‘contemporary’ in the title) techniques used utilizing corpus linguistics. Three chapters are of relevance to my research: the Alice Deignan chapter (Ch. 2) on metaphors; the Yukio Tono chapter on second language acquisition (Ch. 11) and; the Randi Reppen chapter on English language teaching (Ch. 12).
And Corpus Linguistics: Method, Theory and Practice by Tony McEnery and Andrew Hardie is a textbook. Here also are references to SLA, ELT and metaphors and Conceptual Metaphor Theory (CMT). More theoretical in content than practical as indicated by the chapters. The chapters are not on particular corpus linguistic concepts (not your frequency, collocation, etc) but on wider historical developments (neo-Firthian, psycholinguistics, etc) instead.
Will have a more thorough read later.