Halo 5: Guardians is getting a Limited Edition Xbox One console, as 343 Industries studio head, Josh Holmes, has confirmed on Twitter. Holmes has revealed this in response to a fan question, so perhaps it should be seen as confirmation prior to official announcement.
"@juliocurt There is a limited edition console coming, yes. It hasn't been revealed yet, but it's pretty sweet. :)"
Halo 5: Guardians will be released exclusively on Xbox One on October 27, as officially revealed a few weeks ago.