I guess I have to clean up this confusion, even though I wanted to stay away...:
Believe me (as the main programmer behind ExecSG): ExecSG has *never* been 68k. It was being written on the PPC from day 1.
I think it wouldn't make any sense to start such a PPC native OS as a 68k assembly project.
Unfortunately, the wording in the feature list was a bit misleading: It refers to the *OLD* exec, not to ExecSG.
Ok, I'm off again :-D
Thomas