Super GM's are considered 2700+, but I'm pretty sure it's not a formal title, I think it's just to seperate the top players from the other crappy GM's who don't really know how to play chess.
I may be making up that last part though. 
Oh, and if they're going to make a new title, I think it should be Big Sexy (BS). To earn it, you have to be big and sexy, thus the title.
Last years,you can ofthen hear some tournaments,mentioned like:''tournament for super grand masters''...or in chess discussion you can ofthen hear ,''he is strong grand master''
So what is diference beetween grand master and super grand master and how to recognize them? I think chess world and fide organization Super grand masters called players who are 2700+ but I am not sure
Can we expect in near future new title?