At E3 you could apply for the Xbox one original Gears to play on Xbox One,but after getting the code and downloaded it i was then told i needed another code to activate the game which believe it or not has shown up on my Xbox Live messages a few minutes ago.
Considering it ends Monday and it Gears 1 which has no Horde mode then they can stick that where the sun don't shine.
Gears 3 and if your a teenager Halo should have been the first games on Microsoft Backward Compatibility list so they shouldn't really need to ask stupid questions.
You bring your biggest guns and Gears franchise for Microsoft don't come much bigger.
Anyway just rigged up the Xbox 360 and downloaded my profile,now to get the never used Astro A50 Headset working once I've charged the thing as its been left for about 18 months and bought it just for the Xbox One.
Just re/downloaded all my gears 2 and 3 map packs so I'm going to have a Horde night later with my mate.
Horde for me was a reason alone to own a 360 and i adored it

and to be honest its one of only a few reasons why i bought another 360.
I know the possibility is they will eventually come to Xbox One,but i aint waiting until Winter,because thats when this compatibility will be for everyone and there is no guarantee Gears 3 the best one will be on the Xbox One.