It looks like we are running into name space collision with http://drupal.org/project/ckeditor. This may confuse update_status a lot, but I'm not sure.
I hope there will be an upgrade path from previous contrib versions to new core. It looks like core does not support the same features, what is not really wrong, but we may end up with tons of stale variables in the database? Is core going to cleanup them or is there a need to uninstall under D7? I do not like the last variant with a smooth upgrade in mind!