Like Estel, i would drop "significant updates to existing applications" too, IMHO.

For the ports, it's quite difficult to have an opinion, as the work required can vary a lot - porting a Qt app can be desperately easy in some cases, and require a lot of rewrite in other cases, for example.

But apart from that, I have another question: what is a "new" app, for this competition ? Never published on maemo.org / Nokia Store ? Coding begun this year ? I would say the first option seems reasonable, but maybe this rule is already written somewhere :-)