Hi Doris,
as long as the HotPot module for Moodle 2.x is installed in the Moodle 2.2 site, then your HotPot activities will also be upgraded and will be available in the Moodle 2.2 site.
You can of course recreate the HotPot activities in the Moodle 2.2 site, if that is what you want to do.
regards
Gordon