Apple Event "Time Flies" just launched some of the new and most powerful apple gadgets. As the new iPad air gets a fingerprint scanner or a touch ID in its lock button. So probably there can be chance that in iPhone 12 we will be getting a fingerprint scanner in the lock button. As from iPhone 10 to iPhone 11 none of the phone had touchi'Ds as all of them included face i'Ds. iPhone 12 will be launched in October 2020.