Quote Originally Posted by Nezerius View Post
Source is from the unofficial translation from live letter LXX, where Yoshi-P answers with this:
"If you didn't make it in time, you can still use these crystals to obtain the rewards for the previous series, they will stay for one additional patch but will be gone after that".
By "these crystals", he's talking about trophy crystals, as he was talking about them right before this answer.

Although the answer/translation should be taken with a grain of salt, especially since we've yet to see previous Series rewards being added to the Trophy Crystal vendor.
To be fair, we are only in Series 2 and re-adding Series 1 rewards immediately after they ended would defeat the purpose of having Series in the first place.

Series 3 or 4, give it time fellas.