Irony.
The 5 is nice, stupidly light. But I'm hanging onto the 4 until at least the next iteration.
No not irony, I went from a 3GS to a Samsung galaxy nexus which when selling like 7 months later, sold for a measly £175 on eBay! So basically £150. That phone was selling for £400/£500 on release and now it's worth sod all! Won't be making that mistake again, hence why i went for an iPhone 5.