At this point I think it is pretty much a forgone conclusion that 2GB RAM is needed for optimum multi-tasking performance in 64-bit iOS devices. This year, for the first time ever, I didn't upgrade my iPhone at the normal 2-year mark. I am holding out for an extra year in the hopes that the iPhone 6S will have 2GB RAM. Is that a realistic expectation? Does Apple have any precedence of increasing RAM on an 'S' iPhone model?