Why would they ever WANT to end it? They announced it nearly a year in advance for a reason. Getting him back was a major reason to celebrate! The rights were originally relinquished when Marvel were in financial trouble. Now they have Disney money. Conan is going nowhere. Ever. That contract will be perpetually renewed until the character rights go public domain.
They're not "going back" to that costume, it's her current one. Hasn't she been wearing that look ever since her last solo?