Double the number of a Playstation 4.
When Sony revealed that the Playstation 4 would only support 4 controllers at once, Microsoft revealed their Xbox One would support up to 8. Found on the peripheral’s product page, the reveal also says each controller will have a range of 30ft — though who would have an 8-man team play at 30 feet from their TV is beyond me.
As noted on the Playstation 4 article, the fact that the Xbox One supports this feature doesn’t mean the developers will embrace it. Sony cut down the number from 7 to 4 because of just a handful of games using it.