Following the previous news related to the BT bug on the new Mac Pro 2009, we were expecting that the future Mac OS X 10.5. version will fix it. One of our readers had information and shared them with us:
I reported the bug to Apple beginning of April (among with the 10.5.7 beta version, as I am a developer) in order to speed up the release of a fix. The bug is still present in the 9J47 build, and I am waiting for the 9J50 for Mac OS X Server to continue my test. Indeed the the seed note provided with the 9J50 client indicates: "Fixed issue with Bluetooth Personal Area Network (PAN) ".
We are waiting for further information before concluding that this problem will soon be history with the Mac OS X 10.5.7. However, this update might not be released before the WWDC