g613 is the only game in town in terms of wireless keyboards, logitech has the best wireless performance of any device out there.
Overall, keyboard is not something that moves around, which is why wireless isn't popular, because it doesn't give you any advantage..
As for lighting on wireless.. if they did that to the same brightness as what's on the fancy rgb boards today, you're looking at a 5watt device.. sooooo.
Vs a mouse, which has to move..
As for high performance wireless keyboard, w/ backlighting. that's really not possible unless it comes with a HUGE battery.
a 3000mah battery is ~10-12watt of power..
if you used that in a back lit board for 2 hours, it'd be almost drained.
So, backlit is unrealistic for a wireless board.. because you'd be charging it ALL THE TIME, possibly twice a day.
Who would want to charge their keyboard even Once a day.. let along, twice..
To get to a 2 day battery life, assuming 24 hours of total uptime, you'd need 36000mah..
That's 12x 18650 cells 33% bigger than a big ol' lenovo 9 cell laptop battery.