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Set 12 is known to be released in July but if you are looking for a more precise date we need to look at the patch cycle (below)
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There are only two patches during July and it is most likely that:
- Set 12 will be available on PBE from June 26th to July 17th (3 week patch)
- Set 12 official release date will be on July 17th
This is mostly speculation and we need to hear Riot's announcement.
In the meantime, you might want to learn all the best items for all Set 11 units: https://www.tacter.com/tft/guides/best-items-for-all-champions-in-tft-set-11-36d59dfe