One concept for after the temporal war i have is something focusing on species like the Tholian's, Sheliak, and others which are non-human in a galaxy where they are outnumbered by humanoids, and whether the Preserver planet seeding project is related to their xenophobia.
A second would be us finding Preserver sites in the Gamma and Delta quadrants, since we know the Iconians were in what is now Dominion space, it makes sense for their, and our, "parents" to have been there too.
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