OmegaRuby and AlphaSapphire
10000 year Emperor of Hoenn
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- Age 29
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- Seen Sep 24, 2018
I think that's because showing later areas would reveal too much about the games, but that only has relevance with all-new games like X and Y. We've already seen all of the Hoenn cities and know their gym leader types, and other important information that Game Freak would want to keep secret if it was a new region.
I was actually basing my statement on the fact that they didn't show later areas of Johto until like three months after they were announced. So even early remake trailers are limited in that regard.