Actually it takes 4 justices to agree to review the case. I believe they review cases normally on Wednesday. That’s where they decide whether or not to hear a case. I had read that they had already decided to hear the case. Apparently that is not correct. However I doubt the court will refuse to hear a state vs state case as they are the only court of relief for a state.
Correct, the Rule of 4. But that's an appeal. I don't know if that applies to a case of Original Jurisdiction.