"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
AirPods and AirPower: Everything We Know
Apple's Negotiations and the iPhone in Europe
Of interest, they describe that Apple pursued a "divide and conquer" strategy in partnering the iPhone in Europe, pitting carriers against each other. In the end, O2 won the deal, but at a high price:
...at the 11th hour O2 snatched the UK deal with an offer that gave such a high proportion of revenues to Apple that none of its competitors could see any way of making any return on the phone, even over three years. They believed that even if it was treated as purely a loss-leading marketing product, a better return could be had by spending the money elsewhere.
Apple is hosting a media event in London at 10am local time on Tuesday September 18th, 2007. While Apple is widely expected to launch the UK iPhone at that time, there are conflicting reports on the details.
ThinkSecret believes the iPhone will ship in the UK during the week of November 12th, and expect another media event around September 24th for France. Meanwhile, Gizmodo expects the UK iPhone to ship by the end of October.