Apple is working on a 5G-enabled iPad with mmWave support, according to DigiTimes (a subscription is required to read the entire article).
mmWave (millimeter wave spectrum) is the band of spectrum between 30 GHz and 300 GHz. Wedged between microwave and infrared waves, this spectrum can be used for high-speed wireless communications. Another part of the spectrum that’s being used in 5G is sub-6 GHz, which includes the portion of spectrum lower than 6 GHz. These bands are effective at providing coverage and have capacity for a wide range of uses.
Chances the rumor is true, according to the Sellers Research Group (that’s me): 90%. Apple is almost certainly working on 5G-enabled iPhones with mmWave support, so such features on an iPad Pro would seem to be a no-brainer.