I'll be interested to see how well the Curl rides.

If it is ever produced.

I think people here are significantly underestimating the popularity of the Brompton. IMO, Brompton's biggest problem are their production bottlenecks and distribution issues, particularly in the US. I.e., my gf ordered a BTO Brompton on June 15; we're still waiting for delivery. As backlogs have been running around 10-13 weeks for the last several years in the US, this suggests that there is a significant demand for the product which is hampered by production/distribution/delivery issues.

I understand that B is planning on building a US-based distribution center for dealers in the US, where bikes can be assembled in a BTO fashion from frames and parts kept on hand. You can sort of do this in a limited fashion if you order from NYCEwheels or Calhoun Cycles, based on what they have on hand.

I think dealing with these kinds of bottlenecks is much more important to Brompton's continued success than adding more interchangeable parts.