It won't be unless the gear is weaker than the new skirmish gear that was just added. In order to be comparable or better SE will have make it as hard or harder to obtain.
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You do know that chapters is still an option and the exclusive items they mention are the extra "craftables" like we need them now for our Artifact and Relic, right?
Since when were rems tales the only item needed to upgrade gear? Also given how much SE tries to make old content relevant, it would breath more life again into SKCs and HTBs hopefully. I think you are sorely mistaken that they wouldn't use rem tales. They may not though, and we don't know for sure, but you seem overly sure of yourself with no accurate basis. The bold part of your quote is stating that there is items that will be only obtainable from that battle content that will be used. Again, you might be right, but there is absolutely no reason they wouldn't or even shouldn't use rem tales.
"As with artifact and relic equipment upgrades, the items needed to upgrade Empyrean Armor differ based on the armor's current item level." makes me think they will still use chapters.
exactly, it'll be chapters + something from new content that fills the slot previously held by the delve drop item in all likelihood-excepting Rune and Geo which will no doubt be from some new quest.
If it is then expect it to be significantly inferior to the Yorcia Alluvion gear. SE would not make gear that is equivalent to that without also making it equally hard to get.
I don't see why considering how easy it is to get a full set of Empyrean +2 just from repeat logon points now.