Pretty much, yes. All the rewards and packages we are offering are exclusive to this Kickstarter (with the exception of the mini-album replicas which could, theorectically, appear again from another company). Otherwise, the DVDs, blu-rays, booklets, set visits etc. are only available to backers of this project on Kickstarter.
The episodes themselves are different. At the moment, other than various screenings we are lining up, the only way to see the new episodes will be via backing this project. However, it is indeed possible that the three episodes we produce will appear in the future elsewhere. If they do though, it will be only the episodes themselves. All our packaging etc. is exclusive to the Kickstarter.
At the time of writing, there are no plans for future releases, and no discussions have been entered into with anyone. However, it is our hope that, in time, these episodes will become part of the Thunderbirds canon and will enjoy a long life alongside the original series.