If you haven't heard within 7-10 days you are permitted to continue your posturing!
I applied 7 - 10 days ago and haven't heard anything either, but I know of one person (ex hold-pooler) who's been invited back. Its clearly not just ex hold poolers who have been called as some earlier posters with no previous have got the call. I guess there's at least 20-30 peeps (if not more) quietly preparing for the interview and sim.
Who knows? I guess the rest of us will just have to wait and see what happens.