Beetle - patents are in the works, so no substantive news yet. I am beta-developing the technology using the CS1.6 as my test mule. The 1.6 / 1.7 slotted port is unusual in its airflow dynamics. Ports care where they are placed in their enclosures. The 1.6 long slot side-steps some of those placement issues by being placed in the lower chamber at large. So its airflow dynamics are more complex than usual, since the broad placement creates a gradient of interface parameters with the enclosure resonances.
I can report first-hand that the slot works.
I can also report that the interface technology will improve it as well as improve speakers in general - a fluid dynamics solution for fluid dynamics problems.
Plenty more to tell when I can.