Whether you will use your future notebook as a tablet—even whether it will be possible to do so with your machine—will depend on what you buy and how you choose to use it. But make no mistake: Tablet "goodness" will be baked right in, whether your screen has a digitizer or not. Why? Because its very likely that tablet support will be a standard part of the Longhorn OS.
And as we move toward Longhorn, Microsoft is investing a lot of money in hardware technology to persuade notebook manufacturers to make tablet features a standard part of their notebooks. Microsofts goal is to push the marketplace rather than wait for evolution to popularize tablet technology.
Redmond wants tablet technology to work well enough and be inexpensive enough that customers wont give a second thought to buying a Tablet PC. Even the special name will go away as todays Tablet PC morphs into being "just" the notebooks we all buy.