It seems to me that, given the release date of Jaguar, and the fact that Apple will most likely update their notebooks in the fall (like they did last year), the iBook and PowerBook will get built-in bluetooth before the rest of the line.
There's also the fact that the most recent Ti revision abandoned IrDa and the iBook has never had it.
There's also the fact that the most recent Ti revision abandoned IrDa and the iBook has never had it.