I think the teasers are being taken too seriously. Based on interviews Rucka does not like to write out of his comfort zone. No way this is actually going to turn into a "war" between Avengers and Punisher. That's just not his style, unless you consider the fact that Punisher already see everything as a war. I'm guessing that at the end of the current arc/run, Punisher is going to do something that will draw the heroes attention to him, but I doubt it will be anything like Civil War or even Shadowland. Less in line with Iron Man firing blasts at Punisher and more in line with Punisher having to extract and item or information from the Avengers Mansion or come up with crazy badass strategies for avoiding the avengers.