Xbox One XBO/PS4 Twitch Streaming. Will we still want third party hardware?

[RivaCom]

So I know both are coming the capability to stream to services like Twitch. But will they come with anything but a standard stream to twitch?

So for anyone that wants to add additional stuff (ie: Webcams, multiple captures, overlays), would owning something like the elgato capture device be worth it still?

I only ask because I would like to pick one up to start streaming on the xbox 360 until my XBO arrives, but didn't want to buy it if it'll be useless in a few weeks.