Don't see it in the market yet, I assume they're launching it with the Magic (yes, I am going to continue to call it that).
What I am also not sure of is whether they are making it available for G1 as well. I don't see why they wouldn't, but who knows.
"Already a G1 customer? You can use the data service you currently have."
This tidbit is on their "Data Service" page for the Magic, so it could just be referring to the fact that you can switch from a G1 to a Magic and use the same data plan (which seems obvious anyway). But, it's also in the same paragraph about the app pack so I'm hoping it actually means the app pack will be available on the G1, and they just worded it funny.
I am waiting for my Google Voice invite so one way or another I'm getting my visual voicemail.