I would not be surprised at all to see, in say two years, a "CTZ 4040" released, which would be an evolved Multi-IQ-based "flagship." Total speculation, but it's basically in line with the other speculation going on in this thread.
Consider the GPX series...
Gold
Prospecting, an "X," and then model numbers. PI-based gold prospecting units. After the 5000 model, a "new technology" was introduced and incorporated (ZVT -- zero-volt transmission) and so GP
X became GP
Z -- the "Z" to show it's a new technology.
SO, similarly, the CTX...
Coin
Treassure, an "X," and then model numbers. An FBS-based coin/treasure unit. Now that we have the "new technology" of Multi-IQ, a CT
Z would make sense. Hence -- CTZ-4040, a Multi-IQ-based flagship?
And "after" any FBS patent would expire, could make sense...
Just thinking out loud. Useless pondering, I know!
Steve