There are 36 “new” MAC Eyeshadow Singles ($17.00 for 0.05 oz.), which feature a “revamped” formula. Some shades you’ll recognize as long-time, permanent shades, while a few are new, most have appeared in some form in the past as a limited edition shade (or permanent within a palette). All of the new shades are also available in pan-only form for $7.00 each.
P.S. — I didn’t realize that Cobalt was also a new shade (it was way further in the core range), so I didn’t buy that one, which is why there are only 35 swatches; four are in pot-form because the pan-only version was sold out.