It seems to me that ThinkSecret has a source (or several) who knows something but add their own speculation to this knowledge and ThinkSecret conveys both. However, note the difference in language 'Apple WILL upgrade both...' which was what happened in sense, the iPod mini was 'upgraded' by being replaced and the Shuffle 'upgraded' by adding a new flash-based iPod to the line-up.
They did not claim to know when this would happen it was just 'LIKELY not at its media ...'.
Same for the Powerbook, they simply said 'will LIKELY not ...'.
Watch their language, if they say something WILL happen, it will happen. If they say it will LIKELY happen, somebody is extrapolating information, which as all extrapolation does not have to be true.