The thing that's been annoying me and making me doubt an update is the 'Same Business Day' status of ibooks on the US Store. But...if there is an update there will be large spike demand, perhaps Apple have prioritised initial supplies for the US online store to satisfy immediate orders and the Euro/RestOfWorld locations will need to wait until there is a more supply available, hence the 7-10 days everywhere else.
/hits Ctl-R on apple.com
/hits Ctl-R on apple.com