@rcolistete: a substantial upgrade from previous releases to qualify for entry to the 'Updates to existing applications', so they are free to participate if you release a substatial upgrade to their software. And IF "The applications have to run on default hardware running on an official version of Maemo or Harmattan.". Unfortunately that rule might be hard to fulfill (at least the install instructions will be so long that some people might get turned off and not vote for that).

Changing the rules during competition will cause flaming, this suggestion about special category should have been posted before competition has started. But luckily there still is the updates category.