The new edition of Kirchner’s book on German legal abbreviations seems to have appeared now – at least, the publisher says it appeared in April. The hardback and paperback editions now have the same content. Lehmanns Fachbuchhandlung will deliver it free of charge in Germany.
While I’m at it, there’s also a book on Austrian legal abbreviations: Friedl / Loebenstein, Abkürzungs- und Zitierregeln der österreischischen Rechtssprache und europarechtlicher Rechtsquellen, 5th ed. 2001, ISBN 3 214 06205 0