Hi Thomas,
Thank you for your email.
As far as I know G3 is the only protocol to use 6loWPAN.
These are the latest news on G3:
1) We are pleased that IETF will « recognize » G3-PLC in including it in the IANA registry. The corresponding RFC is about to be release (see draft-ietf-6lo-dispatch-iana-registry-02.txt)
2) We have already 30 000 G3 meters in the field now and 500 000 G3 meters by end of June (with 4000 meters installed / day)
3) Other countries as well has started with G3 : Japan (roll out in progress), Belgium, Luxemburg, Austria, …(tender in progress)
4) We have up to 73 platforms and products already certified (with interoperability proven)
Do not hesitate to copy and paste my email on IETF mailing list if needed !
Cheers, Thierry