So in other words, if I understand Quim correctly, "internet tablet" is only a subset of what the new device will be. So Nokia found that the name "internet tablet" is not well-suited for marketing anymore.

In my opinion, for power users, "internet tablet" has always only been a subset of what the tablets are capable of. Now Nokia seems to realize that fact and wants to bring the additional capabilities to the end-users. I guess, for us, the category of the device won't change much. But it'll be a whole new experience for regular users who have lived with an "internet tablet" so far only.