Stefan Richter posted the IEEE1394 subsytem and FireWire subsystem TODO lists noting, "it seems also appropriate to disclose the current manpower behind FireWire driver development and maintenance. There are just two people who regularly work on the drivers: Kristian Høgsberg (author and maintainer of the new firewire subsystem, in the past also involved with the old ieee1394 subsystem) and me (co-maintainer of both the new and old subsystems). But we both have a lot of other projects going on at the moment."
The current IEEE1394 subsystem is available for the 2.6 and 2.4 kernels, also known as the Linux1394 driver stack. Kristian Høgsberg started development of the new FireWire stack, nicknamed "Juju", in December of 2006. The Linux1394 website notes, "when the new stack's initial bugs and missing features have been addressed, it is anticipated that the old driver stack (ieee1394, ohci1394, pcilynx, raw1394, video1394, dv1394, sbp2, eth1394) will be scheduled for removal from the mainline kernel sources. (There is by the way no replacement for pcilynx planned at the moment, because this controller has become very rare.) The main reasons to replace the old stack by the new one are: lower code footprint, hence lower maintenance cost; better security; consolidation of the currently three or four different userspace ABIs (depending on how you count them) into a single, modern ABI."