For the record: I did not expect all my old applications to have ports available, I just expected Nokia not to break compatibility.

Anyway, I have the answer to my question: applications will need to be ported. Only time will tell what will happen now. All I can say is that os2008 is of no interest to me at present (even if browsing is improved) for lack of applications. But I will check in a month or so. And I will get the n810 a bit latter than I thought.