[O] LaTeX preamble from Babel blocks

[Ken Mankoff]

Hello,

I thought I saw a recent mention that instead of

#+LATEX_HEADER: foo

it is now possible to do

#+BEGIN_SRC latex :some-header-option some-value
foo
#+END_SRC

And have "foo" appear in the *preamble*, not body.

Is this correct? I cannot find the syntax searching the mailing list archives. 
Can someone share the syntax, if it exists?

Thanks,

  -k.