Thanks to Ms. N. for this great comparison photo of the new Front Racer Tank laid on top of a Fatigue Cool Racerback. The May release Front Racer Tank was slightly longer by nearly an inch to the Cool Racerback. The new tag calls this length "hip length" but it isn't highlighted in the product name at the top, which it really should be since it's such a substantial change to the design. Either that, or call it the Front Racer II.
Previous version of the Front Racer tank on the bottom with a Cool Racerback on top.