Update: Both figures are now available for preorder from the North American Square Enix Store. The Riku Figure is available for $49.99 and the Aqua figure is available for $129.99.
AmiAmi has put both a Play Arts Kai Aqua figure and a Static Arts Gallery Riku figure up for pre-order, with the figures being released this July in Japan. You can check out the figures below:
[UPDATED] Riku and Aqua Figures Available for Pre-Order