In reply to galpinos:
As far as I know there's no new Envers guide (could there be a reprint, perhaps?). The modern series of Piola guides are:
Envers des Aiguilles (French) 2006
Envers des Aiguilles (English) 2007
Aiguilles Rouges Vol 1 (French) 2008
Aiguilles Rouges Vol 1 (English) 2009
Aiguilles Rouges Vol 2 Light (French) 2012
The Aigs Rouges Vol 2 is as the name 'Light' suggests, an interim guide before the definitive. Not sure when the definitive is due out, but it will be in English and not in French. About three quarters of it is already translated so whether it'll be ready for this year is anybody's guess.
Post edited at 11:42