Update: Polygon Source Info in OP - Kotaku: Xbox Slim This Year, More Powerful Xbox One In 2017, Future Titles to Release on XB/PC, Iterative boxes from now on

[celador]

If both Xbox and PS consoles from now on will be backwards compatible through all iterations, then that sounds great. Should save MS and Sony a lot on R&D as well, so they win as well.

Regardless of the specifics, there is too many rumours now to think that this isn't happening