Just moments ago, General Motors and Honda jointly announced this:

"…an agreement for new advanced chemistry battery components, including the cell and module, to accelerate both companies' plans for all-electric vehicles. The next-generation battery will deliver higher energy density, smaller packaging and faster charging capabilities for both companies' future products, mainly for the North American market."

What's the goal of this partnership? Put quite simply, the target is to deliver a breakthrough battery that will be built by General Motors (long history of battery expertise) and sourced by Honda for future upcoming electric cars. Of course, it's expected that GM electric offerings will make use of this soon-to-be-developed battery too.