No. GM-LAN Requires a different transceiver. CANBus Triple is made for standard Bosch style Two-Wire CAN Busses.
Looking into the available Single wire transceiver chips modifying the PCB to work with a single wire shouldn't be too hard. I am very tight on real-estate on the PCB, but the transceiver chip I'm looking at (NCV7356) uses the same footprint, but different pinouts.
After some research the GMLAN transceivers require more supporting components than I can fit onto the PCB. I'm going to design an add-on that will connect to the pcb that will be available separately or I will use to build GMLAN specific units after the campaign.
Also, I don't want to risk delays on shipping the CANBus Triple to people who just want standard CAN configurations. Testing new designs can be time consuming, and I will not send out any hardware that has not been tested throughly. So any GMLAN stuff will have to come after the kickstarter campaign.