Creator of MagicBand Collectors (which is owned by EA Partners, LLC), it is my goal to catalog and archive the entire history of the Disney MagicBand. I don't work for Disney nor am I associated with them in any way, besides being a mega-fan and living 5 minutes from Walt Disney World. You can contact me at firstname.lastname@example.org.
So does open edition mean I can buy one now online, and then link it if I go to Disney world in 6 months?
No Open Edition just means they are not limited in any way to how many were made. You can only buy solid colored bands online at this time from disneystore.com (the Princesses one you need to buy in the park).