True, you should never see a stroller inside of a queue, but if you've never seen one in child swap that doesn't have a "Stroller as Wheelchair" pass then chances are you've never worked at Universal. Regular strollers are never allowed in a queue, but some TM do have hearts and don't want to disrupt a child sleeping in a stroller and suggest that the parent who is waiting first can take the stroller up the exit and wait in child swap for their party. The exception is attractions that have stairs at the exit and now attractions with metal detectors. Yes, it is not "policy" to let strollers into child swap rooms, but if it isn't affecting safety and it has a positive impact on guest experience then TM are going to be okay with it on a case-by-case basis.
It hasn't been formally announced for either park and all Steve Burke said was an attraction was in the works with no park specifically mentioned, but considering Universal is in the business of cloning both Orlando and Hollywood, it is safe to say that SLoP is coming to both parks at some point.
While I don't post often here or anywhere on the boards, just keep in mind that there are new registrants on the boards every day and some of them might prefer to watch or listen to an overview of basic information then digging through posts to hear the basics