There has previously been a thread discussing the new ETIAS system. Currently scheduled to be rolled out in November 2023, the system will require travelers from the US to preregister to enter the EU.
What you may not be aware of (I wasn't), is a system called EES to be rolled out in late May 2023. EES (Entry & Exit System) is an electronic replacement for the entry and exit stamps in you passport. Instead of a physical stamp, they will collect your photograph (for facial recognition) and thumb print and store it in a computer with your passport info. I read an article (The Times) saying that some countries believe that this will double the time required to process an entry to the EU. "It's almost guaranteed to be a horrifically slow process." So expect long lines, especially when it first rolls out.
I'm off to France in late May, so I guess I'll find out. 
Good news: No more stamps from the EU cluttering up your visa pages.
Bad news: You won't have the stamps as a reminder of your travels.
