Making what changes. What are they doing to get extra life out of the Jaguar well in to the 2020's?
They won't, MS will drop it too. Nextbox will have full back compat AND exclusive games. It's the only realistic way of progress. Book it!
On 360 they had games that couldn't reach as low as the ps3 could, with requirements for developers to stick to their apis, instead of specific low level code.
On xbone they took a step further in have games run on a virtualized environment even with the performance cost added to the weaker console so even old games could be easily brought to a new console.
Moving towards a platform aimed at supporting cross platform development.
Changing the entire OS to this new platform during the ongoing generation to ensure everything they have now works with it.
Merging all their stores together.
Using for the first time a common Xbox live implementation on windows and Xbox (dunno about mobile, but likely there as well). Back in the 360 days Games for Windows Live and 360's Live were two separated networks, not alike how 360's and Xbone's are not the same.
Changing the publisher contracts demanding that any game published on Xbox will have to be available to all Xbox consoles even after Scorpio.
They validate all that by having the S run games faster, and even are using the compatibility of the platform as an advantage to developing for Scorpio. You don't have to code for normal mode or boost mode. Whichever you game does it does faster on xbonex and simply leaving no hard coded blocks is enough to support not only Scorpio but future consoles. This is already an advantage over Pro which just last month had games not having any benefits for it until a later patch.
So, they have been making changes towards that even before the generation begun. Sony on the other hand, haven't made anything of that or close to it, and it's clear how tied to ps4 their development is when it took them months after launch to offer a boost mode and that mode doesn't even expose a large gpu. Looking back at it and the 14+4 CU talk at the beginning of the generation it makes it very likely that ps4 games are designed even with the amount of CUs PS4 had.