Multi-million dollar corporation Walmart accidentally listed RAGE 2 as being available for pre-order in Canada.
The RAGE official Twitter replied with a snarky image which corrects the listing on its lack of key art, non-capitalization of the title, and lack of age rating. However, what the Twitter did not do is deny the existence of a new RAGE title.
It would be irresponsible reporting to start proclaiming "RAGE 2 CONFIRMED!", but nobody on the end of the devs have said it's not happening. It seems that this story could develop as time goes on.
As for now, all there is to do is wait for more details.