Thought I'd update this since Constant Contact hasn't returned to do so in SIX MONTHS! I chatted with support... you have to specifically ask them to enable the next generation editor in your account. Once they have done so, it will ONLY be available for NEW campaigns... your old ones will not change (including the ability to rename sent campaigns) Even though Ariana_L has marked this as closed, internally they are beta testing the campaign renaming feature and it is only available to a select few testers. Clearly it should NOT have been marked as implemented yet! So even if you do upgrade to the next generation editor, you won't get the ability to rename campaigns back yet.
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