I only checked a few of the 17 pages in this thread, so some of this might have been said before. This is just my opinion and things i'm somewhat interested to have implemented in my game so please don't flame
Horror/Nightmare pack: I have the zombie and gore packs, but I'd like to se one with a little more of a creepy environment, like a Silent Hill mood set with shadowy segments, more bloody object and bodies(Hasn't been a whole lot of plain entities that are just dead bodies.)
Sci-Fi: Maybe a few more objects or machinery. Also one thing I would LOVE to see is a semi-futuristic soldier that DOESN'T look like the Spartan soldiers from Halo(Model Pack 12.) They should look a little more like the USMC soldiers in Halo or the troops in Quake 4, or even the marines in the AvP game series.
Modern: Maybe just a few more weapons, god knows we already have tons from the 4 weapon packs. I'd like to see the XM8 and SPAS 12 specificly(Only because the forum threads on those weapons don't show me links or screenies of the weapons on their topics.)Also, I know MP1 gave us some modern soldiers with different textures, but they aren't really of the best quality. I honestly would love to see a few modern soldiers designed similar(If not exact) to the Ranger model that comes with the Character Shop Program(Dont want to spend 50 bucks on one model >_>.)
Characters: I really think we need a new modern character pack, with normal civilians, children, the soldiers I listed above, a few female soldiers(Aiko and her re-textures only do so much), and maybe even the Civil Soldier Set made by JFletcher(Amazing models btw

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Vehicles: Rather than buying them(or downloading) them seperatly on TGC Shop, I'd like to see a vehicle pack just as props.
I guess thats all for now lol