Isn't the new version supposed to be based on FreeBSB 8 ?
Beta versions
Development is currently being done on a FreeBSD 8.2 based version of m0n0wall that brings better support for current hardware (especially new WLAN and Ethernet controllers), as well as massive improvements to the IPv6 support.
EDIT:
Sorry my mistake, i see now that the development version is 1.8 branch...