Not being snarky here... I'd really like to understand this. Can someone explain to me the difference between these "SB+" cards and legacy FP (other than the fact that they don't fit in your wallet and have to be manually handed out by a CM, that is.)?
At the moment these paper cards are being used to handle a surge in guests at a particular attraction (in this case A&E). It is similar in the sense to legacy FP that you get a slip of paper with your return time and a virtual queue, but it is currently not a permanent fixture in the park like the legacy FP machines were, as of now.
Universal is doing something similar with the popularity of the new Harry Potter attraction (though that might have more to do with the fire code/space and sheer number of people) but essentially when there is a huge surge of guests they can activate machines which spit out a ticket with a return window for later on in the day. Then you are free to explore the rest of the parks at your leisure.