The Frontline Force modification have updated thier site with some new information on version 1.8. Here's a brief run down in points of what is planned to be included:
*A revised map list, which will remove less popular maps but make the FLF files smaller for 56k users.
*A new support class, the support will now have a KSP90 that will boast a high rate of fire, but low damage.
*Code reduction and optimization, by removing legacy Front Line Force and Half-Life code (say, for instance, the code for the DM crossbow...), the size of the server.dll has been dropped by about 100k.
*Various bug fixes.
*A weather system, this includes rain, snow, lightning, thunder, splashes and ripples in the water.
Source: FLF Mod