The still-step-three N810 WiMAX Edition is scheduled for release later this year and will contain, well, a WiMAX radio. As WiMAX is one of the "pre-4G" technologies, this means, effectively, that Nokia will be shipping a phase three tablet with a cellular radio.

No, it's not GSM or EDGE--what the "if only the N8x0 was cell phone" people want today. However, by the time phase five rolls around, do you think those would be still be considered for inclusion?

Step four might appear late this year or early next. Maybe. Regardless, we'll probably see a few variations within it as well, pushing step five pretty far into the future.

By the time step five is reached, IP-based 4G technologies should be taking off nicely, and they'll be an automatic inclusion in Internet tablets. The tablets will have been playing that game since step three, after all.