There’s an interesting new article on the Nordic Blogs on Bluetooth 5 Advertising Extensions . It explains how the number of channels is increasing, from 3 in Bluetooth 4.0, allowing larger advertising payloads in one of the 37 other data channels. A single advertising packet can hold up to 255 bytes of data, up from 37 in Bluetooth 4.0. The chaining of packets allows for larger payloads up to 1650 bytes.
As the article mentions, we have to wait until tablets and smartphones support Bluetooth 5. Also, we have to wait for new Beacons with Bluetooth 5.