Sadly yes, once a bundle is retired, it's retired for good and never coming back. BUT, just like today, some pieces of a bundle may come back as a Throw Back Thursday. Today, they bought back the Mount and Pet of the Hawkrider Bundle but I don't understand why they never bring back the gear of the bundles. I wish they would bring back the gear attire of a bundle for once, it would be awesome thou. But yea, sadly, once a bundle is retired, the whole bundle will NEVER come back, only parts of the bundle may come back during a Throw Back Thursday thing or something else.