No, an existing form should still work. I would publish metadata prior to upgrading to 2015 (Settings > ClickDimensions Settings > click on "Metadata") to ensure that your metadata is up-to-date with us. Then it should be available after the upgrade of CRM to 2015.
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"CRM 2015 Compatibility for ClickDimensions" in Announcements - comment added by Matthew Wittemann
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