The G3C has been approved but won't hit the roster til around Nov 8. Below is the response I received.
Good Afternoon,
All firearms, except the Glock/FC Arms M3S, were approved by the Board at the September 16th HRB meeting. The approved firearms will be in the next MD Register issue on October 9th. You have to allow 30 days for objections and if none, the firearms will be legal for sale and on the handgun roster on November 8th. The minutes from the September HRB meeting will not be posted on the website until after they are approved at the next HRB meeting on December 9th.
Thank You,
The MD Register can be found here, Handgun Roster info starts on p36 with the G3C info on p37
http://www.dsd.state.md.us/MDR/4721.pdf
Thank you very much for posting this!