It wouldn't be the first time Google didn't use the same internal code name for its operating system as the name it announced. (mobilesyrup.com)
As for those curious about what «Trello» means in English, it's a variation on Trellis, which was the tool's internal code name before its launch. (entrepreneur.com)
«Redstone», the unconfirmed internal code name at Microsoft for the next big update to Windows 10, could actually be released in two separate updates. (windowscentral.com)