The rumour is that the cut-down Xbox 360 being able to plug into the Durango hardware to provice backwards compatibility, suggesting that there may be some external bus present. If this is a high-bandwidth bus, then perhaps it may be used for future upgrades to slot in, extending the life of the console. Alternatively, it may just present a subset of the Durango to the plug-in 360 only giving access to IO.

Still, it would be an interesting development. What do you think, are upgradeable systems worthwhile? I think so.

It wasn't a good idea for consoles in the past but since it's not consoles anymore but entertainment hubs (which also leads to record sales for "consoles") it should work.
If they call it Infinity after all, they better make it last at least 15 years (2x 360 lifetime)

Really? I doubt it. This would require a *very* high-bandwidth-bus, something in magnitues of pcie 3.0. I still think that the nextgen-consoles will be the last console-gen with the concept we now know.

PCI-E 3.0 could handle it, it has a relatively large amount of bandwidth provided they go with 16 lanes.

However, the new Xbox *is* going to be using an AMD processor, so it wouldn't be far-fetched for them to use Hyper-Transport 3.1 over PCI-E 3.0 instead, which is another 150Gbit/s faster over PCI-E 3.0.

They could also be doing a Nintendo and adding an external bus in just for other external peripherals to be connected to in the future, a-la Satelite TV, it's essentially a "just in case" scenario, or they might be adding an external bus in order for them to be able to diagnose and fix consoles easier when they are sent in for repairs. - However at this point it's all speculation untill microsoft says otherwise or we get the hardware in our hands.

Nintendo should've done this with Wii U, added a PCI- 3.0 to it and upgraded as necessary as the years went on.