Well, the blog post states the following in reference to 3G:
I know the binaries for the iPhone 3G are taking a while. Everything is basically done and all the code I have is in the source repositories so people are free to build it for themselves.
The binaries will have more features than the iPhone 3G demo showed: It will have full calling and sound support. The code for that (and everything else) is already finished and is in my github if you would like to check it out.
He says "all the code I have is in the source repository", and "The code for that (and everything else) is already finished and is in my github", referring to 3G call support AND sound support.