You seem to have spectacular stats (I saw from your other post). And if the interview went well, why so pessimistic?!
I haven't applied yet (planning for next year), so I don't know much for sure, but is this happening earlier than usual? For me, having to wait until the end of January doesn't sound soon enough haha.
Did they ask anything like what you want to study if you are admitted and whom you want to work with?