B:
As The Hill reports at least three of the justices would have let the entire thing to go into effect immediately.
"Justices Clarence Thomas and Samuel Alito, along with the newest Justice, Neil Gorsuch, Trump's nominee to the court earlier this year, wanted to lift the entire ban, according to the order."
C: The order issued today suggests that the Trump administration's review of immigration practices may have concluded by the time the court hears the case, making the entire issue moot. Yes, that's a not-so-subtle way of telling the admin to 'get the lead out.'
It's unlikely that those three justices will change their minds between now and the fall, so it would seem opponents face an uphill battle. Still, it's the SCOTUS, so you never know. For now, this is a big win for President Trump, and yet another big loss for Democrats who continually try to pretend the Constitution doesn't say what it clearly says.