Glad you know now what you've got to look for - I'm waiting on the EE version of the 920 myself!
Cortana won't be available straight away unfortunately; she was supposed to be accessible in the UK during July but apparently that's been pushed back. Expect to see her on your phone in August, or September at the latest. Download the WPCentral app for your phone and read their articles as they arrive - as soon as she is available, WPCentral will tell us!