iOS10 will likely be iPad4+ and iPhone5 +. Those devices still have a ton of power left. Would be interesting to see what the cut off for OS 10.12 will be.
ipad 3 ipad 4 and ipad air 1 all have the same ram but new A chip
its time too drop ipad 2 ipad 3 ipad 4 ipad air 1 from IOS 10 any thing less then 1GB should not have a upgrade too IOS 10
same gos for iphone iphone 4S iphone 5 iphone 5S iphone 6 and 6 pluse that has less then 1 GB of ram needs too be drop from IOS 10
same gos for ipad mini 1 mini 2 mini 3 wish less then 1GB of ram should not be upgradded
now i think wih iphone and ipad that has 2G of ram or more like the ipad mini 4 the iphone 6s and 6S pluse ipad air 2 ipad pro 9.7 and ipad pro 12.9 will get IOS 10 i think that is how it is going too go any thing less then 1GB of ram no IOS 10 any thing with 2GB or more will get IOS 10
i think apple is geting ready too move on and drop every thing that has 1GB of ram or less