The rumor about two new lines of lenses for the camera system is interesting. Assuming the rumors are correct, I hope the final explanation is not a boring one. In the meantime, we can at least speculate.
Clearly the focus is on the SL lenses, which suggests it is likely not a native T mount camera. And calling the second line TL rather than T suggests these are not simply regular APS-C T mount lenses. While it may seem wasteful in the short term for Leica T users, this may allow for a smooth transition to a full-frame version of T (a TL, perhaps) later on. This would then suggest that the Leica SL and Leica T(L) are sufficiently different systems in terms of ergonomics/usability and/or features to justify having both in the market at the same time.
I haven't really taken closer a look into the T mount (I don't know the sensor-to-flange distance, for example), but I guess they could also build a new mount that allows use of two lens systems without adapters. Thus, it could actually be a native T mount with some extra bits and pieces that makes it impossible to mount SL lenses on the original T system camera(s). This would be a more expensive implementation, but Leica may not fret over a couple extra euro spent per camera. There are usability advantages to this approach, but it can also create some confusion.
