- brighter Kilrathi ships, from the Kamrani to the Hvar'Kann
- much, much more effective missiles, as from now on, anti-fighter missiles can reasonably be expected to kill enemy fighters in one or two hits if they connect, and they WILL connect unless you are doing a lot of dodging maneuvers or, for light fighters, you outrun the missile. They will also be largely more reliable as to intercept enemy cruise missiles... if you angle your shots correctly (a deflection shot is much less likely to hit than a rear or frontal shot, like in real life).
-- FF missile: very agile, short range, low damage, 9 seconds worth of fuel, usually carried by bombers for self-defence purposes
-- ImRec missile: agile, intermediate range, intermediate damage, 15 seconds worth of fuel, usually carried by medium fighters
-- IR missile: minimum agility, long range, high damage, 20 seconds worth of fuel, usually carried by light fighters for sniping
Keep in mind too that as all units tend to fire more at missiles, a frontal encounter between several flights will probably end up with some missiles being shot down before impact. But now, getting the drop on an unaware flight from missile range can be quite devastating.