On 10/05/2012 08:22, Joseph Wright wrote:
> The functions \cs_get_function_name:NN and \cs_get_function_signature:NN
> are deprecated, and will be removed from expl3 by 2012-08-31. These
> functions are entirely unused in a current TeX Live installation.

These are actually in use in l3doc, and so will be retained but marked
as 'internal'. As such, they may be altered further in the future.

Sorry for the confusion.
-- 
Joseph Wright