This probably means that if backtrack finally gets to this new kernel the problems with IWL 5K should be automatically fixed. But this is a long time to wait, so thanks for your post. I will probably use it when I need it. But currently there is no need.
Kernel 2.6.34 (RC2 for now) delivers fixed Broadcom b43 drivers, and allows injection with 4315 and 4312 chipsets. This kernel is currently in testing, and should be out of RC stages in a couple of months. As of now, it seems that the future transition of BackTrack to this kernel will bring a significant amount of improvements, as well as a more mature mac80211 stack.