To sort of answer what your original question was(having a hard time finding it on the last page), but I assume you are asking what is there to be excited for in this new CoD that will hopefully give you the same hype you had for CoD 4 ?
Well if we dissect all of its components at a glance you'll get:
The conclusion to the trilogy started story wise in CoD4. So expect the most refined CoD campaign of the 3 because at this point they should be hitting their stride, and ending it with a bang.
Spec Ops returns, but has several variants. If you have a buddy you love playing co-op with, then expect a much more extensive and time consuming variety of modes to tackle and have fun with.
MP is a bit of a toss up in the sense that they want that CoD feel that makes CoD well... CoD, but they are trying to still add stuff to the game WITHOUT fucking up the balance so much as they did with MW2. Think of it as fixing what's wrong with MW2, giving people what they liked about MW1 and 2, and then adding a big new layer on top of that.
Things that the MP is offering that I personally like is:
16 all new maps. (Most games ship with jack shit and 10 at most)
A bevvy of new guns.
MORE customization to suit different play styles.
MORE focus on rewarding team players in various ways rather than just lone wolfers.
New game modes to possibly encourage new ways to play.
Tons of refinements to the leveling and unlock mechanics to keep you hooked.
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That's the best I can do to try and explain my personal excitement for it, and going back to it this year, even though Black Ops I played for a month tops, and MW2 before it was capped out 3 months, while MW1 I lose track of since I played it so damn much. I am hoping this is going to be what I wanted out of MW2, and will hopefully keep me hooked much longer this time, because I do like a LOT of what CoD offers, but the last 3 games seem to have buried that under a rubble of shit. There seems to still be some shit that makes me feel uneasy, but not enough to deter me away from the good I'm seeing in the things posted above.
If you have friends you play with, and you both enjoyed CoD together, then this is probably worth the 60 bucks this holiday season.
*Who won that Poem contest for Arkham City by the way for the PC version?*