Apple is said to be working on two curved display iPhone models for the "second half of next year," according to a source speaking to Bloomberg, with a likely released planned for the third quarter, and building better touchscreen sensors that introduce fine pressure sensitivity for later devices to be introduced after that.
from TechCrunch http://techcrunch.com/2013/11/10/apple-iphone-6-curved-glass/
from TechCrunch http://techcrunch.com/2013/11/10/apple-iphone-6-curved-glass/