@TT - you're right about the post, they are linked. I wonder why I didn't spot this at first. But to me it makes situation even more confusing and the policy on advertising on wp.com blogs even less clear.
As I understand it, we cannot say "no ads" as part of what we like about WP, because, as we are told, we actually have ads on our blogs. Even though when we signed up there were no ads and the current policy says no ads. (Special circumstances execpted as we now know). We can't see the ads (which are part of a test and contextual), at the moment we can't control them (shiver) and we don't know if our readers can see them. (I am really hoping not). I suppose we must just wait and see what options we are going to have to prevent them if we don't want them. Those of us who want to of course... as some seeimingly can't wait to rake in their $$millions.
We still need to have a very clear policy on all forms of advertising.