Release date of "Learning OpenCV", 2nd edition

If I would (pre-)order "Learning OpenCV, Computer Vision in C++ with the OpenCV Library", when should I receive it? It says something like 'march 2015'. I'm suprised that, on Amazon, they don't say explicitly you will have to pre-oder. In case I would pre-order, is there a chance I get the pdf of the draft in the meantime?

Thank you in advance,
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