Any older devices that may not have been patched or were unable to be patched will probably attempt to set themselves ahead tomorrow.
And there may be more on Sunday night. It's likely that some consumers didn't upgrade their older devices. Instead, they changed their clocks manually. That's worked so far. But the devices are still programmed to change the time on the original daylight time start date. They will change the time by an hour unless that feature has been turned off.