psh....whats to improve? just update graphics, engine, and what not, and you have yourself an awesome stealth game. the AI is all that really needs improvement; that suspicion meter didnt follow basic logic as much as it could have.
keep the newspaper end of level thing; that was perhaps one of the coolest things about blood money, seeing how your handiwork is interpreted by the ignorant masses....or just seeing how your psychotic rampage was received; either way, its was one of the most gratifying level-completion screens ive ever seen.
some more opportunities for sniping? i guess that would fall under just more options in general, but there was only one or two levels were i was actually able to use the sniper effectively.
all and all, just updating the technical side of things will produce a great game in this sea of online MP mediocrity growing around me, so as long as it isnt cancelled or something, im fine.