A 26-member advisory panel was appointed by the UN Secretary-General on July 31st, 2012.
   See the 
press release (pdf) for the composition and the Terms of Reference for the High-Level Panel. 
 Shorter biographies and the terms of reference are provided in html 
here.  Follow 
#post2015HLP on twitter. 
 The HLP is due to report its results by the end of May 2013, before a response from UN Sec-Gen Ban in July 2013.