It's Alive in the Labs posted a link to Project Twitch today. Here you can us Revit, Inventor, or AutoCAD without installing it. What? It's called Cloud Computing or Software as a Service and software (in some sectors) is moving to this model.
The advantages are that you can access the application from anywhere (limited to 1000 mi from the server in this preview) and not just at your desktop and the system requirements should be less. Be sure to read about the other limitations of this technology preview. No saving or uploading your files. This isn't for production, it's for "fun."
Given court rulings such as Vernor v. Autodesk, I wouldn't be surprised if ALL Autodesk software eventually moves to a similar model. With a delivery method similar to this ADSK could shut off the service (just like the power company) if you didn't pay your bill or didn't use the product according to your agreement. I think it would also cut down on pirated software, since you would need access to their server to run the software at all.
Could this be the next iteration of Subscription? Hmmmmmm