I purchased the Leap Motion and 10m cable for the same prices as you. I already bought plan A for the 8kX with the eye tracking. I sent a ticket about the items and was sent a $70 coupon and was told the Hand Tracking module will be sent. Since the upgraded headstrap comes with the new headset, they will likely give you a bigger coupon.
I do not know yet what i will use the coupon for but i’ll bet they create something i want.