While Apple announced two different sizes of iPhone's at their last announcement they didn't announce an "affordable" iPhone 6C to follow up last years iPhone 5C. Now it seems according to some leaked pictures from Future Supplier it looks like the 6C is on it's way.
Looking at the leak photos it seems that this newer device would not be the larger size the iPhone 6 plus carries but would be simply more of an upgrade to the 5C. Getting a dual flash upgrade and having a second speaker grill on the bottom.
I don't know these photo's are true leaks or not however it is reasonable to assume Apple would keep the iPhone C line up going into the at least the near future.