there are a lot of different pinhole cameras for medium format. a few wooden ones and of course the holga pinhole wide.
but none have I ever heard to have that kind of modability. I say the market is ready for something more advanced!
specially if you can change cones mid roll.
also, the ability to shoot smaller formats would be good too. but more in the way that people might have a favorite aspect ratio. I much like the possebilities of 6x12... 6x9 is too normal in my eyes. but still, someone might want their 6x9, 6x7 or 6x6. 6x4.5 I find hard to beliave. then they wouldn't buy this camera. 6x6 might be a stretch -but still a nice offering.
anyhow, if I would buy one? maybe. being able to choose either 4x5 or medium format really makes it interesting in my eyes though.
btw, how to the other Titan cameras handle filters?