Also look at the following two phrases in Loeb's statement after Citroen's announcement:
"I was surprised when I learned that I won't move forward to defend the colours of Citroen Racing in 2016."
"I am disappointed that the adventure stops after two years because I had the desire to go get this title."
Translated from his official website on autosport: http://www.autosport.com/news/report.php/id/122150

This was followed by a statement from Citroen that Loeb wasn't "fired" and just moved over to Peugeot.
http://www.autosport.com/news/report.php/id/122150

There's lots of other PR stuff in the statement but these two lines indicate he didn't want it this way. If he wanted to retire it would have been more about mutual decisions and time to stop (and even then it's not sure it's true ). So it looks like he's not happy with Citroen but does that mean he will go to a rival or return to the WRC? Or will he go back to try Le Mans or something like that? He may not be happy with Citroen's decision but he sour so that he would go against them?