The supposed new facet to the GM-Honda partnership doesn't just focus on a powertrain, reports The Yomiuri Shinbun, but also in getting suppliers to lower prices because now you have two automakers ordering parts together. Building plug-in hybrids and fuel cell cars together might be a thing, too, Yomiuri says. The 2013 hydrogen partnership was made between two leaders in the field (the announcement press release talks says, "GM and Honda rank No. 1 and No. 2, respectively, in total fuel cell patents filed between 2002 and 2012." But if these new rumors are true, then it's more of a bit of catch up for Honda (which had a great but unsuccessful car in the Accord PHEV) while GM gets more tech to better challenge Toyota. That's how the Yomiuri presents it, anyway.
A Honda spokesperson told AutoblogGreen that, "Honda and GM's collaboration in the co-development of next generation fuel cell systems is making good progress. Engineers are discussing how we might expand the relationship utilizing each other's strengths, but there is no fixed plan regarding specific areas or timing."