It will be incremental upgrades...you are making too much out of it honestly. There are no big changes under the hood. Consider it an i3-i5-i7, but with an APU in mind and clearly not as drastic in difference.
The OS should be the base for several years and AMD slowly throwing better APU's in the system. This isn't complicated.
i agree, but assuming you would have to buy a whole new console with better guts the market for used consoles would be a clusterfukk.