By the time the new SE comes out the iPhone 17 will be at the end of its design cycle. If the SE is a guinea pig seems safe to say that it won't make it into the 17--unless they have two designs to give to Foxconn that they can make a late decision on after a couple months of SE data. But maybe they are confident enough in the modem that they are already planning to put it in the 17. Kind of like the iPad pro being the first machine with an M4.