When I paste a schematic using Eagle v6.0's new "Paste From" that has a bus in it, it does not handle bus renaming well or even properly.
The most intuitive thing would simple be to rename the bus itself, and then all the new signals would follow. I spoke to George at USA tech support and he agreed and suggested that perhaps even an expandable tree for the bus items so that each signal could be individually renamed if desired, but that otherwise they would follow the new bus name in the same grouping as the original bus.
Thanks for continuing to improve the software.
TC