I have requested (and received) a link layer type identifier for libpcap. This is a magic number that can be used as a link layer type in pcap traces to identify the pcap as containing LoRa captures from the air. This link layer type is to be used with an encapsulation which I've drafted myself: LoRaTap (https://github.com/eriknl/LoRaTap), recently the dissector for LoRaTap has been merged into the Wireshark master branch. This means you'll be able to open LoRaTap pcap files with the nightly builds.
At the moment I'm working on the LoRaWAN dissector that will be able to dissect the actual data in a LoRa frame with the LoRaWAN syncword. Please stay tuned while I'm working on this, I'm expecting to submit an early version to gerrit this week.
Meanwhile it's time to get TTN as well as manufacturers started on logging their radio data to pcap using the LoRaTap encapsulation so we can use it in Wireshark