Anything from a main stream news site?
Plenty. See the "Sources" section
here.
What's odd about this "PLAN" emergency alerts system are two things:
1. It required a special chip to be embedded in all new phones, instead of using the already existing Cell Broadcast (CB) feature of the GSM standard, that all phones have.
2. It uses GPS to determine your position, instead of using cell tower multilateration. Besides being a battery drain, GPS gives off your exact position and is simply not necessary for alerts such as tornadoes or earthquakes. One needs not be a conspiracy theorist to think of the other possible use of mandatory GPS in a special chip in all new cell phones.