I think they are teasing us with more backward compatible games to come.
I bet you're right!
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I have plenty of Xbox 360 games that aren't backward compatible. Some will never make it (licensing and/or hardware requirements) but I'd welcome anything they offer.
Some obvious examples that will never make it: Guitar Hero Series, Rock Band Series, and... (drum roll)
The Xbox One cannot access hardware via the Xbox 360 emulator to support certain titles, such as those using an instrument controller or the Xbox 360 Kinect accessory.
Licensing is another factor but might only affect a few titles. Other than that, it boils down to performance. Here is an example (with OG Xbox titles on Xbox 360):
does this mean there will be more achievements ^^
There will be a phase 2 with more achievements. It'll most likely be related to this update.
Oh joy... stack time for me
No confirmation if Java will have Xbox achievements or not.
Become a mercenary. - Cyberpunk 2077
Awarded for completing the coming of age ceremony atop Cobblestone Tor. - DRAGON QUEST XI S: Echoes of an Elusive Age - Definitive Edition
Escape from the deep dark Wild. - Call of Duty: Black Ops Cold War