As Otou points out in response to your post, blue posts have said expertise will confer spell hit in the final version of MoP. If that isn't implemented yet then yes, your spells will miss if you're below the spell hit cap. This doesn't mean you should gear to the spell cap, but that you need to worry more about expertise than Unholy does now in Cataclysm. Although this has already been discussed and you should have searched and found this out before posting, I'm telling you this to be helpful, not in censure. This seems like something worth revisiting until it's fixed.
So this warning isn't for my beloved Rule 7, but rather for woeful neglect of your shift key. In the future, please use proper capitalization. Thanks!
im just looking now on the beta and testing stuff for unholy. I'm hit capped for melee attack but it seems like we have to go for the full spell hit cap i am missing on almost all of my spells atleast once or twice everytime i use them seems like we no longer have that passive spec "racial" that gives us the spell hit cap.