The FTB launcher doesn't automatically update the mods. When(and if) an new version of unleashed comes out for 1.5, it'll probably have updated versions. You could always go and update it yourself, but be warned. You may get conflicts.
I think the problem is that IC2 dosent really have midtech. I really like gregtech because it adds a midtech to IC2 and adds a whole slew of awesome end tech on top of already awesome IC2 endgame.