http://www.redhat.com/software/linux.../packages.html
has no mention of Kismet....
and it still has kernel 2.4.18 {though probably heavily patched with RH updates and quirks}
but there are quite a few software updates that would make a difference... {hopefully making installing kismet a little bit easier}
gcc 3.2, GTK2, KDE 3.0.3,PCMCIA 3.1.31
so... I too will be waiting before updating my ehem... customized system... :-)