I guess everyone else is waiting for their RFM95 radios to arrive in the post from China?!?
I can confirm that MySensors 2.1 works on ProMini (W5100 MQTT Gateway & ProMini Node) using RFM95/LoRa.
I used the wiring and edited the W5100.h file (not sure i needed to, i tested RFM69 working first) as in this post in the forum - [SOLVED] W5100 Ethernet gateway with RFM69 Radio fails at init
The node didnt connect to the gateway at first but after adding capacitors, stating the RFM Frequency and reducing the transmit power to 2 (gateway and node were 1m apart), it came to life.
Just tested with door switch but all looks good.