There has been little information about Apple's AirPower wireless charging platform since it was announced along with the iPhone X and iPhone 8 in September, but a new MacOtakara report states that the charging platform will be shipped sometime in the second half of the month. March through VentureBeat.
The AirPower mat differs from most other wireless chargers by offering support for charging up to three different devices at once. (Obviously, Apple anticipates that these will be an iPhone, an Apple Watch Series 3 and a pair of AirPod, but, in theory, it should support three devices with Qi load). There is an extra level of software in addition to the usual Qi stuff that will add some additional animations when you place the phone to charge, as well as show the charging levels of all three devices on an iPhone.
According to MacOtakara, there is some extra technology working to ensure that Apple Watch Series 3 can load, since the device is typically designed to work with Apple's own magnetic load disks. The report states that the AirPower mousepad can detect a specific radio signal that indicates that an Apple Watch Series 3 is on the mat, then allows the watch to load on Qi, which may explain why wireless Qi chargers that work with Apple Watch is so difficult.
Nothing is yet known about the price of the AirPower charging mat, but Apple's website still claims that it will come out sometime in 2018. The March date would also make sense if Apple celebrates a March hardware event as in years previous; The event could also include new iPads, which were rumored earlier this week.