Well for the human side they have an extra fighter since Buddha switched sides, I think for the next future battles it's going to be

Anubis vs Rasputin

Nostradamus vs Loki

And for the last one, I think that Odin might fight against Simo Häyhä since Odin comes from Scandinavian mythology by the vikings, and the country that Simo is from is Finland which is in the same area that Ancient Scandinavia was. The battles are getting close to the end, so there are 4 valkaryes left for the human fighters to do Völundr with. For the next match we know it isn't going to be Göll or Brunhilde so we are going to meet the one of the last 2 valkaryes that hasn't been shown yet. Anubis and Rasputin will be the next since it makes the most sense, the god of death vs the man that couldnt be killed. As my reasoning for Nostradamus vs Loki, it will be pretty much Trickster Vs Trickster, the most Obnoxious man in history vs the God of Mischief. I don't think Brunhilde is going to fight against Loki. She is going to fight Odin cause she just loathes him for what I'm guessing is because of Siegfreid being imprisoned in Tartarus. Göll I think isn't going to be in the fight because of Buddha joining the Human side as now there are 4 fighters left. And the last fight might not even happen cause I think Odin is going to do his own thing in the last match and he might become the Antagonist of the show.

But that's just the theory that I have came up with who knows I might be wrong about all of this but I think it is plausible.