Coconut battery is good if you know how to use it.I checked the battery with coconut battery app and found out my machine was 6 months old and had 96% max charge and 4 cycles. I was a little surprised it was this "old". The exterior was perfect, and look brand new. To some this is worth it if its a work machine, but I'm not bleeding edge nor use it for work, and hold on to my stuff. I ultimately bit the bullet for a new one because of the battery. My current Macbook Pro is almost 7 years old. It has 275 cycles and 95% battery capacity. Knowing this, for a few hundred less was NOT worth it to me. My .02. I will say tho, it is a beautiful machine. LOVE the updates. The keyboard and speakers are awesome! New one was 1.5 months old.
For example, I do have 2012 Retina MBP 13", and coconut says it was produced in September, 2013. Should have been last batch before next gen.
In your case, of course it is 6 month old, because at the announcement event, it should be ready to ship within a week.
So they can't make it out of thin air. They have already inventories stocked, sitting and waiting for shipment.
Also, Coconut battery doesn't know how much mAh in a macbook, nor it knows how many health it has.
It only knows its' voltage and calculates everything else by the formulas. So your actual battery health is just projected guess taken from your current usage. Also coconut needs longer periods to make better guess. Also even with new things, battery chemicals differ one from another. You could have it better or worse. That is why Apple doesn't guarantee you the health of the new battery, because retaining 100% health is a problem of a good luck and chemicals.
The only thing that Apple guarantees, is that after 1000 cycles you should have at least 80% of health. So if you are under warranty, and it drops below 80% before 1000 cycles, you'll be covered.