Kanji and Yukiko basically confirmed.
Smart money's on the full P4 cast being in (Minus Rise for obvious reasons) with only three P3 characters.
With two left, I can't imagine Mitsuru being left out, since in terms of plot relevance she's right behind Aigis.
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I like how each new topic you make reveals such varied facets of your idiocy. - foolmo
Now this is entertainment!