[Ronnie]

Speaking to GameSpot, Microsoft Game Studios VP Phil Spencer advised gamers to keep hold of their Xbox 360s if they want to play XBLA games.
"Those games will continue to run on your Xbox 360 for as long as your Xbox 360 runs," he said.

"The box is not backward compatible and we think for somebody who invests in a large digital library that you want to keep your [Xbox 360]."

Spencer indicated that Microsoft intends for the Xbox 360 to co-exist with its new console, and reasoned that accessing Xbox Live accounts on both system was intended to facilitate this.

"You don't have a separate identity on Xbox One or [Xbox 360]; it's the same, you are you. My friend's network is the same on both boxes, my achievements are the same. So we think that service component is an important component to keep constant across both devices.!

Following its Xbox One reveal event, Microsoft confirmed Xbox One is not backwards compatible with Xbox 360 games. According to the company, the lack of support was due to fundamental architectural differences between the two consoles.

"[Xbox One is] architected to take full advantage of state-of-the-art processors and the infinite power of the cloud," it read.

The platform holder also promised to support its previous console "well into the future" with games and new apps. It went on to promise a 'huge' Xbox 360 reveal at E3.

Source

[Anarchist]

I'm not that bothered with this to be completely honest, seeing as there's rarely any Xbox LIVE Arcade games which I play, other than Minecraft and Doritos Crash Course. According to Microsoft, the Xbox One is going to be adding high-definition arcade games to the Marketplace. These will replace the current Xbox 360 Arcade games.

[Ronnie]

As Minecraft is now out on a Disc, maybe they will re-design the game for Xbox One, allowing them to add more stuff.
and maybe someone will develop Tekkit for Xbox One if it's now possible ;o

[Banadmin]

This is exactly what I was speaking to my friend about the other day. Yes, you can't play Xbox 360 games on the Xbox One, why complain? Just keep your fucking Xbox 360.. It's all planned obsolescence.

[Gambino]

I'm not getting rid of my Xbox 360.