All TL and SL lenses use the same mount, David. They will work on the original T, the TL, TL2, CL, and SL cameras. Without adapters.
For at least a few reasons, Leica knew they had to have a single mount (not two separate ones) for this new auto-focusing lens series.
So, although I don't have an SL super-wide angle zoom (hopefully Leica announces one soon) I can use the 11-23mm TL lens on the SL - although the camera does crop the active sensor area to APS-C size. Alternatively, I could use the 24-90mm SL zoom on the Leica T, although that's a massive lens for pretty small body.
The only caveat is that TL lens firmware updates must be done on T, TL, and CL bodies, while SL lenses must be done on the SL.
I'm about to see what I gathered yesterday for pics ... Hopefully something worth working with!