More info:
According to the manufacturer, they chose PBT over dye sub or ABS for balancing price and quality. If they did dye sub (as is the norm for Topres) the price would have gone up $25~35 on top of it's current retail price of $172, landing closer to $200 in the end. Pricing is key as this board will serve as an entry level Topre board.
All parts except key caps are manufactured and shipped from Japan, assembled in China, then shipped to Korea where final packaging is done. Topre has agreed to build this board under the condition that it will not be sold in Japan.
A white version may become available in May~June.
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I understand the reason behind choosing PBT but damn, I would have preferred dye sub even if the price is close to $200. At least make it an option.