Not sure if this is correct or not, but in the 193 page document I couldn't find anything about a 10:1 leverage. what I did find regarding this matter:
Paragraph (a) of the proposed rule change states that no member shall permit a customer to initiate a forex position (as defined below) with a leverage ratio greater than 1.5 to 1. Thus, at the time a customer initiates a forex position, the customer must deposit at least 2/3 of the notional value of the contract. Using the example in supplementary material .01, a customer entering into a forex contract representing $750,000 of a foreign currency must have an initial deposit of at least $500,000. The proposed rule change differs from the leverage limits in the FCM channel, where depending on the foreign currency selected, a customer at 400 to 1 leverage would need only an initial deposit of $1,875.