The PCA70B (l) and PC-A71B (r) differ only in their external appearance. Each features five 5.25in bays, 10 internal 3.5in bays, (of which three are removable) and, of course, internal space for motherboards measuring 12in-by-13in.
Consequently, even AMD's upcoming foot-long Radeon 2900 XT (should I even say that?) will fit in without problems.
The cases measure 615 (d) x 595 (h) x 220 (w) mm and are equipped with six low-noise 120mm fans. They should be available in August for about $259.