Nothing new really, we've been at some kind of war for the past 15 years.
No superpower (China, Russia, etc...) would use nukes due to MAD. And with tech another Pearl Harbor is unlikely. Guided missiles need to come from somewhere.
Higher chances of terrorist attacks than superpower attack.
I hope the horse doesn't get beaten again on the above statement. I have no evidence to support the above, just what I'm thinking in my head.