Thank you for reaching out to Constant Contact's API Support.
While there are no current plans to retire the Tags feature, we don't have immediate plans for any new development involving our Tags feature at this time. Our v3 API does have advanced Custom Fields features, which work well with our new Segments feature allowing you to easily segment out your list and replicate the behavior of Tags.
See here for details on our Segments feature: http://knowledgebase.constantcontact.com/articles/KnowledgeBase/25205-Define-Your-Own-List-Segments
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