"Other basic maintenance" is probably the 27 point inspection, top off fluids, adjust tire pressures, lube, etc.....that come standard on regular maintenance visits.
I just got my tires rotated (for free) by the dealership. That's all I've had done to my Volt so far in 8 months. I actually received 2 sets of free oil change coupons, but because my oil life is still at 86%, I ended up not using them before they expired. But the service rep said I can still get a free oil change next time it is due. Might get it changed at the 1 year mark, just because.