great now more and more devices are using the 5ghz band. Before you know it, 5ghz will be as crowded as 2.4 ghz band. My Turtle Beach headsets are already causing interference with my Dual band router.
What i meant to add, was, it's not needed. 2.4 ghz is fine for mouse and keyboard, 5ghz is normally used for the bandwidth it brings, as well as interference free. But on keyboard and mouse, it can use low bandwidth protocols, such as bluetooth, which also is 2.4ghz but has it's own channel that nothing else can use. (routers, headsets, etc...)
Its not like these devices can saturate that frequency at all, let alone 2.4GHz... this is just changing for the sake of change. In fact, operating at a higher frequency would mean significantly lower battery life, so this change is netting you an inferior product.