We are happy to announce that the following paper has been accepted for publication at the 18th International Conference on Implementation and Application of Automata (CIAA'13) that will take place in Saint Mary's University, Halifax, Nova Scotia, Canada, on July 16-19, 2013. Implementation Concepts in Vaucanson 2 Akim Demaille (1), Alexandre Duret-Lutz (1), Sylvain Lombardy (2), and Jacques Sakarovitch (3) (1) LRDE, EPITA (2) LaBRI, Université de Bordeaux (3) LTCI, CNRS / Télécom-ParisTech http://publis.lrde.epita.fr/201307-CIAA Vaucanson is an open source C++ platform dedicated to the computation with finite weighted automata. It is generic: it allows to write algorithms that apply on a wide set of mathematical objects. Initiated ten years ago, several shortcomings were discovered along the years, especially problems related to code complexity and obfuscation as well as performance issues. This paper presents the concepts underlying Vaucanson 2, a complete rewrite of the platform that addresses these issues.