I have to chime in here
I'm a Chaosium free-lancer, so take this with whatever salt you need.
Chaosium couldn't easily produce CoC d20 products until freelancers were available to write them. Freelancers (like me!) don't usually have access to pre-released material, so they don't have any more of a head-start on CoC d20 than you do.
Now, I just finished up my d20 conversion of Masks of Nyarlathotep (Lynn has a copy of the draft in case I get hit by a car --- again!). However, it's not DONE. For it to be DONE, I need to play-test (I have 2 groups on the play-test), and revise, revise, revise until I'm sick of it. (If I was doing this for a living, I'd stop now, but I'm doing this is for fun, so I'm going to be a little bit of a perfectionist on it)
In other words, it takes time to produce good work. If you are being made to wait, it is because a free-lancer or Chaosium is trying to produce the best possible product. As part of my conversion, I have new spells, new monsters, and new rules for handling foreign languages to play-test.
In the mean time, if you have great ideas, write them up and propose it to Chaosium. You might be surprised at the reception. I know I was.