64-bit improvement
I find it amusing that there is this entire argument about 64-bit processing when the first real improvements won't be on "performance" but will actually be on "efficiency", and on a smartphone efficiency translates as power savings. That's all. Of course if Apple is in fact using a Cortex A53 dual-core processor with an attached Cortex-M3/M4, then they are just following common sense.
Apple did not disclose the amount of RAM on the iPhone 5S (we can safely presume 5C will be identical to the 5, ie: 1GB), but if all you are looking at is memory addressing then you're looking in the wrong place. A 64-bit processor like the A53 will bring with it some nice enterprise features, including virtualization, which is like the Pandora's Box of enterprise computing. If Apple can bridge iPhone and Macs properly, you've got a world of software possibilities at your fingertips.
What astounds me is that Apple hasn't really presented anything worthy of praise. They've taken concepts that have been around for a while and just repackaged with the iPhone brand value. It's worth a lot, but some time down the road, even the flock will start questioning the shepherd.
What Apple did:
Let's call it "C" for Colorful and we'll let people think "C" is for Cheap...( £469 is not cheap, or affordable). It's cheaper to make, no doubt, but it's definitely not affordable. On the other hand, let's up-price the 5S by a tenner and say it's 64-bit, that'll shut the techies up.
I have a dual-core 1.5GHz Windows Phone 8 with 512MB of RAM, FWIW. I'm ecstatic with it. It's cheap, it's cheerful and it DOESN'T slow down like my previous Android phones. I'm far from a Windows fanboi, but I recognise that you don't NEED to pay an arm and a leg to have better-than-iPhone kit.