From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Bach <phaebz@gmail.com>
Subject: Re: [New Exporter] org-export-latex-after-initial-vars-hook
Date: Thu, 6 Jun 2013 12:48:10 +0000 (UTC)
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To: emacs-orgmode@gnu.org

> Is there a hook that is run before actual LaTeX export of a given
> org-mode buffer in the new exporter engine?
> 

For reference:
I got it to work by adapting the snippet from Bruno Tavernier[1]:
#+begin_src emacs-lisp
(defun my-auto-tex-cmd (backend)
    "When exporting from .org with latex,
    automatically run latex, pdflatex, or xelatex as appropriate,
    using latexmk."
    (let ((texcmd))
      (setq texcmd "latexmk -pdf %f")
      (if (string-match "LATEX_CMD: pdflatex" (buffer-string))
          (setq texcmd "latexmk -pdflatex=pdflatex -pdf %f"))
      (if (string-match "LATEX_CMD: pdflatex-shell-escape" (buffer-string))
          (setq texcmd "latexmk -pdflatex=pdflatex --shell-escape -pdf %f"))
      (if (string-match "LATEX_CMD: xelatex" (buffer-string))
          (setq texcmd "latexmk -pdflatex=xelatex -pdf %f"))
      (setq org-latex-pdf-process (list texcmd))))
  (add-hook 'org-export-before-parsing-hook 'my-auto-tex-cmd)
#+end_src

One thing that tripped me up initially was the requirement for the function to 
accept exactly one argument (unused in this case).

[1] http://lists.gnu.org/archive/html/emacs-orgmode/2010-10/msg00218.html