It can only be SSD developments, really, like a successor to M.2 when that gets saturated (although it's PCIe based so I doubt that'd happen any time soon). USB 3.1 is very new and PCIe 3.0 won't be a bottleneck for a long time. Anything GPU related won't affect chipsets (for gamers at least).Unless something new gets released from the chipset point of view that you really must have on a new mobo, then I'd say the 4770k will last for many years to come.
A new CPU instruction set might appear at some point that drastically improves performance for certain workloads, but this again usually doesn't help gamers or prosumers. It's more for server or specific workstation applications.