The current map. I've added the start of *Finland, *Estonia, and the Buddhist state along the Caspian shore, but I have no idea what their borders are or should be.
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Okay, so with that, here's what I think is left to plan out:
France and Iberia: They're still almost all (partially Latinized?) Celtic-cultured...I think? And Muslim.
Britain: Haven't the foggiest idea.
Rome: Waiting for Sam.
Central Europe: Still pagan? I kind of what a unified pagan *Germany but beyond that have no idea.
Northern Europe: No idea. Probably still pagan?
Eastern Europe: Ditto. I literally have no idea what would even go here, considering there are no Slavs.
North Africa: Muslims of some sort.
West Africa: Who is inland?
Sub-Saharan Africa: ...?
Arabia: Christians hold Mecca, Buddhists in Oman, beyond that, no idea.
Central Asian Steppes: Yeah.
China: We need to figure out the split of the Magyars and how exactly *Shogunate China breaks down.
Korea: No idea, some invaders perhaps.
Japan: Aside from what Krzowwh suggested, no idea. Mainland Japan is going to be an event chain in-game somehow.
Southeast Asia: Pretty much all of it needs work, aside from Sumatra and Christian Khmer.
Central/South America: No clue, except the Tupis. In fact, even North America could use some improvements IMO.
And even existing regions can still be changed.