Conexio Technologies' Stratus is an open source LTE-M/NB-IoT Cellular-IoT development kit based around Nordic Semi nRF9160. Stratus can charge battery from solar power & comes with 500 MB global data plan. Stratus will be available on Crowd Supply.
Espressif has announced a new RISC-V SoC called ESP32-H2 with IEEE 802.15.4 (Thread & Zigbee) and BLE 5.2 capabilities. The product is aimed at Smart Home and IoT applications.