The Spy needs a combative spec? That's pretty much all the Infiltrator does is combat. Frenzied Attack, Natural Brawler, Dodge, (Improved) Stunning Blow - how does that not count as a combative spec? Also, while the Assassin would likely fit, as I said no Career has more than 2 repeats, which is the way it should be. I would be very, very surprised if they gave the Spy the Assassin as well.
I do agree that they need a social monster spec, and probably a master of disguise type, which could potentially be the same spec, although maybe they should be separate? I'm not sure. But yeah, the Spy does not lack for a combat spec at all.
Sorry; I should've said a shooter spec. Bond shoots people plenty of folks with his various Walthers, and Jahan Cross is pretty handy with a blaster; none of the existing specializations even have Ranged [Light] as a career skill.
And I always forget that Infiltrator handles the hand-to-hand stuff; "Infiltrator" doesn't sound like the name of a krav maga-esque expert to me.