Does the Explorer Cab have two landing bays as detailed it previously released concept art? If so, what ships can land there?

No, these were intended to be drone bays a la 2001, but we removed them in favor of the secondary engines when we decided to allow the Explorer cab to separate from the rest of the ship. They (and drones in general) may be added back in a future module, but for now the only bay available is the single, larger bay seen on the Hope-class.