I'm pretty sure it will just be displays - not actual sales. It's not just about training Apple store staff - the o2 staff (assuming it's o2) also need some training - and that certainly hasn't started yet.
Says who?
Of note, the Apple Store staff is being called in at 2 for special training tomorrow after the 10am announcement, and the store is staying open until 10. Is that to sell iPods? You have no idea what O2 has or hasn't done to train their staff so why make such assertions?