A post on the Major Nelson blog, Microsoft revealed that the controllers would arrive in the US and Canada this month, with "other select regions" getting them in April. The Copper edition will be sold in Gamestop and on the Microsoft Store, while the Dusk edition will be sold in Best Buy for a limited period, and also on the Microsoft Store.
Here are the two new controllers together:
The Dusk Shadow model is a new standard controller, meaning it comes with the added 3.5mm headphone jack and minor improvements given to the slightly redesigned Xbox One controller that arrived last year.
Microsoft has also revealed the Copper Shadow edition, a vaguely self-explanatory title.