Tablet IS coming
All signs point to it. I really can't imagine anyone who uses an iphone as much as I do (and I'm not making many phone calls) who wouldn't see the benefit of a bigger screen. This isn't for carrying around out in the wild, like a phone. This is made for moving from your dock on your desk to the couch, kitchen table, bedroom, or around your office.
When Apple produces this tablet, which is probably within 12 months, but after the new iphone release, it will HAVE to be multitouch. I don't think it's Apple any other way. That means iphone OS, not MAC OS. After iphone SDK, there will be a ton of software for this platform. I also believe Steve won't port iphone OS to x86 systems because he could lose control of his hardware and software more easily. It'll probably run on PA Semi proprietary designs.
Steve will want this to be as flat as possible, so no optical drive. No hard disc either, just 32 GB flash. WIFI n so it will stream seamlessly. Bluetooth keyboard optional. You really don't need any other computer (for my low grade purposes) if you mate this with a time capsule. Apple TV built into the tablet so you can download your itunes HD movies directly.
You high-power users will undoubtedly still require pro platforms. Other than on websites like this, are there many of you out there? After all, it does seem Apple is moving deeper and deeper into the CONSUMER market, though not yet abandoning you PROs.