The official N5 thread: speculate!!

[Jason1]

I personally like the idea of wireless being the standard, as long as the controllers work from 30 feet or so and have long battery life. The console should have ONE small port on the side for recharging your controllers, and each controller will have a port on it to plug other controllers into to charge them as well, enableing you to charge multiple controllers at once, creating a chain effect of sorts. I think that would work. No more ugly controller ports.