Looks like the next level of Relic is about to come..

[panzertroll]

the "+1/+2/+3" isn't exclusive to XI, it's from the "Final fantasy" series

There was item +1/2/3 at the start of the first version of FFXIV.

Well my thought on that was they wanted the upgrade to be named, because just saying +1 gives no sense of ending. Zenith can mean upwards or the highest form. X Zenith is the highest that X can get. If the relics can be upgraded further, and they get a new name or transform into something else entirely, then it'd make sense.

Instead of just calling it X +2.

One information about the new relics is missing in the english version of the 55th letter of the producer. It's the name of these relic +2.
This name appear in the Japanese and french live letter.

Relic+2 are named "weapon of the Zodiac"

「ゾディアックウェポン」という概念もパッチ2.2からスタートするのですが、こちらはまた追々……。

Ce sera le début des "armes du zodiaque", mais je n'en dis pas plus.

So.. we have ...
- Relic weapons
- Zenith weapons (relic +1)
- Zodiac weapons (relic+2)