From our brethren down under:
http://www.drive.com.au/motor-news/mercedes-prepping-heavily-reworked-gclass-20140504-37r5a
http://www.drive.com.au/motor-news/mercedes-prepping-heavily-reworked-gclass-20140504-37r5a
The only part of the article that makes me question its veracity is "The codename for the heavily reworked G-Class remains W463." Surely such major changes would warrant a new designation.
To be fair, the article is over a year old....